Do the children of a sister who died before the deceased inherit? And must the sister's son repay the remaining amount to the heirs, after the deceased gave him a sum to help purchase an apartment and repaid half of it during her lifetime?

Debts incurred by a deceased woman must be settled from her estate before its distribution. If the deceased has no heirs other than a full brother and a sister, the estate is divided between them, with the male receiving the equivalent of the share of two females. That is, it is divided into three shares: two shares for the male and one share for the female. The sister's children do not inherit. A gift is owned by complete possession, and it is not permissible to revoke it after it has been possessed. So, if the deceased had gifted money to her sister's son and it was possessed, he is not obligated to pay the remaining amount, and he has the right to reclaim the amount he paid to his aunt from her estate before its distribution. Matters of inheritance are complex and must be presented to Sharia courts.