Etymology
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kin (n.)

c. 1200, from Old English cynn "family; race; kind, sort, rank; nature" (also "gender, sex," a sense obsolete since Middle English), from Proto-Germanic *kunja- "family" (source also of Old Frisian kenn, Old Saxon kunni "kin, kind, race, tribe," Old Norse kyn, Old High German chunni "kin, race;" Danish kjön, Swedish kön, Middle Dutch, Dutch kunne "sex, gender;" Gothic kuni "family, race," Old Norse kundr "son," German Kind "child"), from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups.

In the Teutonic word, as in Latin genus and Greek [genos], three main senses appear, (1) race or stock, (2) class or kind, (3) gender or sex .... [OED]

Related to both words kind and to child. From 1590s as an adjective, from the noun and as a shortening of akin. Legal next of kin (1540s) does not include the widow, "she being specifically provided for by the law as widow" [Century Dictionary], and must be a blood relation of the deceased.

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lambkin (n.)
1570s, "little lamb" (mid-13c. as a surname), from lamb + diminutive suffix -kin.
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kinship (n.)
by 1764, from kin + -ship. Relationship covers the same sense but is a hybrid.
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Jankin 
masc. proper name, from Jan, variant of John, + diminutive suffix -kin. In Middle English, often applied contemptuously to priests.
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kinfolk (n.)
also kin-folk, 1802, principally American English but the earliest references are British; from kin (n.) + folk (n.). Kinsfolk is recorded from 1844.
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-kin 

diminutive suffix, first attested late 12c. in proper names adopted from Flanders and Holland. As it is not found in Old English it probably is from Middle Dutch -kin, properly a double-diminutive, from -k + -in. Equivalent to German -chen. Also borrowed in Old French as -quin, where it usually has a bad sense.

This suffix, which is almost barren in French, has been more largely developed in the Picard patois, which uses it for new forms, such as verquin, a shabby little glass (verre); painequin, a bad little loaf (pain); Pierrequin poor little Pierre, &c. ["An Etymological Dictionary of the French Language," transl. G.W. Kitchin, Oxford, 1878]

Used in later Middle English with common nouns. In some words it is directly from Dutch or Flemish.

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akin (adj.)
1550s, "related by blood," contraction of of kin; see a- (1) + kin (n.). Figuratively, "allied by nature," from 1630s.
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pannikin (n.)

"small metal cup for drinking," 1823, from pan (n.) + diminutive suffix -kin. Described originally as a Suffolk dialect word, OED reports it "Exceedingly common in Austr[alia]."

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kindred (n.)

c. 1200, perhaps late Old English, kinraden, "family, lineage; race, nation, tribe, people; kinsfolk, blood relations," compound of kin (q.v.) + -rede (see -red). With unetymological first -d- (17c.) probably for phonetic reasons (compare sound (n.1)) but perhaps encouraged by kind (n.). As an adjective, 1520s, from the noun.

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kinsman (n.)
"man of the same race or family; one related by blood," c. 1200, kenesmen, from late Old English cynnes mannum; see kin + man. Kinswoman is recorded from c. 1400. "The word is commonly and properly used only of a relative by blood, in contradistinction to relatives by marriage, who are properly termed affines" [Century Dictionary, 1902].
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