Second , every man that had sold himself to another was to be released back to his family. And in all the land of your possession ye shall grant a redemption for the land. If thy brother be waxen poor, and hath sold away some of his possession, and if any of his kin come to redeem it, then shall he redeem that which his brother sold. We can see that only those who were in the family could redeem their brother and his possessions. This was to ensure that each family in the nation of Israel would have an inheritance in the land.
Redemption is a family matter.
Only those who were next of kin could redeem a brother or his possessions, the land of his inheritance. In the book of Ruth we have the story of the kinsman redeemer. Because Elimelech, the husband of Naomi, and their two sons had died in Moab without having children, therefore there was no children insure that the family would have an inheritance in the land. Boaz, brother of Elimelech, was a near kinsman and willing to redeem Naomi and Ruth. Boaz was very careful to make sure that the nearest kinsman had the first chance to redeem Naomi and Ruth because the right of redemption belonged to him.