'Kin' in the Bible

‘No one shall approach any blood relative of his to uncover nakedness (have intimate relations). I am the Lord.

You shall not uncover the nakedness of (have intimate relations with) your mother’s sister or your father’s sister, for such a one has uncovered his blood relative; they will bear their guilt.

except for his relatives who are nearest to him, his mother, his father, his son, his daughter, and his brother,

He shall not become unclean as a relative by marriage among his people, and so profane himself.

‘If a fellow countryman of yours becomes so poor he has to sell some of his property, then his nearest relative is to come and buy back (redeem) what his relative has sold.