'Kinsman' in the Bible

He must not make himself unclean [as] {a kinsman by marriage}, defiling himself.

"If your brother becomes so poor that he has to a sell portion of his inheritance, then his nearest kinsman redeemer is to come and redeem what his brother has sold.

If a person doesn't have a kinsman redeemer, but has become rich and found sufficient means for his redemption,

either his uncle or his uncle’s son may redeem him, or one of his blood relatives from his family may redeem him; or if he prospers, he may redeem himself.

If a kinsman redeemer decides to redeem it, then he is to add a fifth to your valuation."