Family

A family is a group of people who, in most cases, live together. They share their money and food and are supposed to take care of one another. Its members are either genetically related (like brother and sister) or legally bound to each other, for example by marriage. In many cultures, the members of a family have the same or a similar surname.

The family in accordance to the Catholic doctrine is treated in many articles of the Catechism of the Catholic Church starting from the article 2201. [1]

A family is said to be society's smallest unit, its nucleus. Family life is more private and intimate than public life. But in most countries there are laws for it. For example, there are restrictions for marrying within the family and bans for having a sexual relationship with relatives, especially with children.

Types of families

Three types of family on the basic of size

are: nuclear family, single-parent family and extended family.

  1. A nuclear family is made up of parents and one or more children living together.
  2. A single-parent family is one where there is one parent and one or more children.
  3. An extended family or joint families means father, mother, daughters, sons, grandparents, uncles, aunts, cousins, nieces and nephews. In many countries including China, Pakistan and India, extended or joint families traditionally live together.

Both the "nuclear family" and the "single-parent family" are also called the "immediate family".

Foster families are families where a child lives with and is cared for by people who are not his or her biological parents.

Closeness

Some family members are related closer to each other. Consanguinity is a way of measuring this closeness.

Degree of
relationship
RelationshipCoefficient of
relationship (r)
0self100% (20)
1mother / father / daughter / son [2]50% (2−1)
2half-sister / half-brother25% (2−2)
2sister / brother50% (2⋅2−2)
2grandmother / grandfather / granddaughter / grandson25% (2−2)
3half-aunt / half-uncle / half-niece / half-nephew12.5% (2−3)
3aunt / uncle / niece / nephew25% (2⋅2−3)
4half-cousin (or half-first-cousin)6.25% (2−4)
4cousin (or first-cousin)12.5% (2⋅2−4)
4sesquiple-cousin (or sesquiple-first-cousin)18.75% (3⋅2−4)
4double-cousin (or double-first-cousin)25% (4⋅2−4)
3great-grandmother / great-grandfather / great-granddaughter / great-grandson12.5% (2−3)
4half-grandaunt / half-granduncle / half-grandniece / half-grandnephew6.25% (2−4)
4grandaunt / granduncle / grandniece / grandnephew12.5% (2⋅2−4)
5half-first-cousin-once-removed3.125% (2−5)
5first-cousin-once-removed6.25% (2⋅2−5)
5sesquiple-first-cousin-once-removed9.375% (3⋅2−5)
5double-first-cousin-once-removed12.5% (4⋅2−5)
6half-second-cousin1.5625% (2−6)
6second-cousin3.125% (2⋅2−6)
6sesquiple-second-cousin4.6875% (3⋅2−6)
6double-second-cousin6.25% (4⋅2−6)
6sesterple-second-cousin7.8125% (5⋅2−6)
6triple-second-cousin9.38% (6⋅2−6)
6quadruple-second-cousin12.5% (8⋅2−6)
4great-great-grandmother / great-great-grandfather / great-great-granddaughter / great-great-grandson6.25% (2−4)
5half-great-grandaunt / half-great-granduncle / half-great-grandniece / half-great-grandnephew3.125% (2−5)
5great-grandaunt / great-granduncle / great-grandniece / great-grandnephew6.25% (2⋅2−5)
6half-first-cousin-twice-removed1.5625% (2−6)
6first-cousin-twice-removed3.125% (2⋅2−6)
6sesquiple-first-cousin-twice-removed4.6875% (3⋅2−6)
6double-first-cousin-twice-removed6.25% (4⋅2−6)
7half-second-cousin-once-removed0.78125% (2−7)
7second-cousin-once-removed1.5625% (2⋅2−7)
7sesquiple-second-cousin-once-removed2.34375% (3⋅2−7)
7double-second-cousin-once-removed3.125% (4⋅2−7)
7triple-second-cousin-once-removed4.6875% (6⋅2−7)
7quadruple-second-cousin-once-removed6.25% (8⋅2−7)
8half-third-cousin0.390625% (2−8)
8third-cousin0.78125% (2⋅2−8)
8sesquiple-third-cousin1.171875% (3⋅2−8)
8double-third-cousin1.5625% (4⋅2−8)
8triple-third-cousin2.34375% (6⋅2−8)
8quadruple-third-cousin3.125% (8⋅2−8)
8octuple-third-cousin6.25% (16⋅2−8)
5great-great-great-grandmother / great-great-great-grandfather / great-great-great-granddaughter / great-great-great-grandson3.125% (2−5)
6half-great-great-grandaunt / half-great-great-granduncle / half-great-great-grandniece / half-great-great-grandnephew1.5625% (2−6)
6great-great-grandaunt / great-great-granduncle / great-great-grandniece / great-great-grandnephew3.125% (2⋅2−6)
7half-first-cousin-thrice-removed0.78125% (2−7)
7first-cousin-thrice-removed1.5625% (2⋅2−7)
7sesquiple-first-cousin-thrice-removed2.34375% (3⋅2−7)
7double-first-cousin-thrice-removed3.125% (4⋅2−7)
8half-second-cousin-twice-removed0.390625% (2−8)
8second-cousin-twice-removed0.78125% (2⋅2−8)
8sesquiple-second-cousin-twice-removed1.171875% (3⋅2−8)
8double-second-cousin-twice-removed1.5625% (4⋅2−8)
8triple-second-cousin-twice-removed2.34375% (6⋅2−8)
8quadruple-second-cousin-twice-removed3.125% (8⋅2−8)
9half-third-cousin-once-removed0.1953125% (2−9)
9third-cousin-once-removed0.390625% (2⋅2−9)
9sesquiple-third-cousin-once-removed0.5859375% (3⋅2−9)
9double-third-cousin-once-removed0.78125% (4⋅2−9)
9triple-third-cousin-once-removed1.171875% (6⋅2−9)
9quadruple-third-cousin-once-removed1.5625% (8⋅2−9)
9octuple-third-cousin-once-removed3.125% (16⋅2−9)
10half-fourth-cousin0.09765625% (2−10)
10fourth-cousin0.1953125% (2⋅2−10)
10sesquiple-fourth-cousin0.29296875% (3⋅2−10)
10double-fourth-cousin0.390625% (4⋅2−10)
10triple-fourth-cousin0.5859375% (6⋅2−10)
10quadruple-fourth-cousin0.78125% (8⋅2−10)
10octuple-fourth-cousin1.5625% (16⋅2−10)
10sexdecuple-fourth-cousin3.125% (32⋅2−10)


Relationships

Same generation

XKinshipKinshipKinship
personwifesister-in-lawcousin-in-law
husbandbrother-in-law
daughterdaughterniecefirst-cousin-once-removed
sonsonnephew
daughterstepdaughterstepniecestep-first-cousin-once-removed
sonstepsonstepnephew
mothermother-in-law
fatherfather-in-law
sistersister-in-law
brotherbrother-in-law
nieceniece-in-law
nephewnephew-in-law
grandmothergrandmother-in-law
grandfathergrandfather-in-law
auntaunt-in-law
uncleuncle-in-law
cousincousin-in-law
great-grandmothergreat-grandmother-in-law
great-grandfathergreat-grandfather-in-law
grandauntgrandaunt-in-law
grandunclegranduncle-in-law
first-cousin-once-removedfirst-cousin-once-removed-in-law
second-cousinsecond-cousin-in-law
great-great-grandmothergreat-great-grandmother-in-law
great-great-grandfathergreat-great-grandfather-in-law
great-grandauntgreat-grandaunt-in-law
great-grandunclegreat-granduncle-in-law
first-cousin-twice-removedfirst-cousin-twice-removed-in-law
second-cousin-once-removedsecond-cousin-once-removed-in-law
third-cousinthird-cousin-in-law

First generation

XKinshipKinshipKinshipKinship
personmotherstepmotheraunt-in-lawfirst-cousin-once-removed-in-law
fatherstepfatheruncle-in-law
daughterhalf-sisterstepsisterstepcousinstep-second-cousin
sonhalf-brotherstepbrother
daughtersisterhalf-sistercousinsecond-cousin
sonbrotherhalf-brother
granddaughterniecehalf-niecefirst-cousin-once-removedsecond-cousin-once-removed
grandsonnephewhalf-nephew
granddaughterhalf-niecestepniecestep-first-cousin-once-removedstep-second-cousin-once-removed
grandsonhalf-nephewstepnephew
mothergrandmotherstepgrandmother
fathergrandfatherstepgrandfather
sisterauntstepaunt
brotherunclestepuncle
niececousinstepcousin
nephew
grandmothergreat-grandmotherstep-great-grandmother
grandfathergreat-grandfatherstep-great-grandfather
auntgrandauntstepgrandaunt
unclegrandunclestepgranduncle
cousinfirst-cousin-once-removedstep-first-cousin-once-removed
first-cousin-once-removedsecond-cousinstep-second-cousin
great-grandmothergreat-great-grandmotherstep-great-great-grandmother
great-grandfathergreat-great-grandfatherstep-great-great-grandfather
grandauntgreat-grandauntstep-great-grandaunt
grandunclegreat-grandunclestep-great-granduncle
first-cousin-once-removedfirst-cousin-twice-removedstep-first-cousin-twice-removed
second-cousinsecond-cousin-once-removedstep-second-cousin-once-removed
second-cousin-once-removedthird-cousinstep-third-cousin
great-great-grandmothergreat-great-great-grandmotherstep-great-great-great-grandmother
great-great-grandfathergreat-great-great-grandfatherstep-great-great-great-grandfather
great-grandauntgreat-great-grandauntstep-great-great-grandaunt
great-grandunclegreat-great-grandunclestep-great-great-granduncle
first-cousin-twice-removedfirst-cousin-thrice-removedstep-first-cousin-thrice-removed
second-cousin-once-removedsecond-cousin-twice-removedstep-second-cousin-twice-removed
third-cousinthird-cousin-once-removedstep-third-cousin-once-removed
third-cousin-once-removedfourth-cousinstep-fourth-cousin

Second generation

XKinshipKinshipKinshipKinship
persongrandmotherstepgrandmothergrandaunt-in-lawfirst-cousin-twice-removed-in-law
grandfatherstepgrandfathergranduncle-in-law
daughterhalf-auntstepauntstep-first-cousin-once-removedstep-second-cousin-once-removed
sonhalf-unclestepuncle
daughteraunthalf-auntfirst-cousin-once-removedsecond-cousin-once-removed
sonunclehalf-uncle
granddaughterhalf-cousinstepcousinstep-second-cousinstep-third-cousin
grandson
granddaughtercousinhalf-cousinsecond-cousinthird-cousin
grandson
mothergreat-grandmotherstep-great-grandmother
fathergreat-grandfatherstep-great-grandfather
sistergrandauntstepgrandaunt
brothergrandunclestepgranduncle
niecefirst-cousin-once-removedstep-first-cousin-once-removed
nephew
grandniecesecond-cousinstep-second-cousin
grandnephew
grandmothergreat-great-grandmotherstep-great-great-grandmother
grandfathergreat-great-grandfatherstep-great-great-grandfather
auntgreat-grandauntstep-great-grandaunt
unclegreat-grandunclestep-great-granduncle
cousinfirst-cousin-twice-removedstep-first-cousin-twice-removed
first-cousin-once-removedsecond-cousin-once-removedstep-second-cousin-once-removed
first-cousin-twice-removedthird-cousinstep-third-cousin
great-grandmothergreat-great-great-grandmotherstep-great-great-great-grandmother
great-grandfathergreat-great-great-grandfatherstep-great-great-great-grandfather
grandauntgreat-great-grandauntstep-great-great-grandaunt
grandunclegreat-great-grandunclestep-great-great-granduncle
first-cousin-once-removedfirst-cousin-thrice-removedstep-first-cousin-thrice-removed
second-cousinsecond-cousin-twice-removedstep-second-cousin-twice-removed
second-cousin-once-removedthird-cousin-once-removedstep-third-cousin-once-removed
second-cousin-twice-removedfourth-cousinstep-fourth-cousin
great-great-grandmothergreat-great-great-great-grandmotherstep-great-great-great-great-grandmother
great-great-grandfathergreat-great-great-great-grandfatherstep-great-great-great-great-grandfather
great-grandauntgreat-great-great-grandauntstep-great-great-great-grandaunt
great-grandunclegreat-great-great-grandunclestep-great-great-great-granduncle
first-cousin-twice-removedfirst-cousin-four-times-removedstep-first-cousin-four-times-removed
second-cousin-once-removedsecond-cousin-thrice-removedstep-second-cousin-thrice-removed
third-cousinthird-cousin-twice-removedstep-third-cousin-twice-removed
third-cousin-once-removedfourth-cousin-once-removedstep-fourth-cousin-once-removed
third-cousin-twice-removedfifth-cousinstep-fifth-cousin

References

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