Is it permissible for the grandson of the orphans' wet nurse to marry the daughter of the second wife of the father of these orphans?

There is no impediment to the marriage of a woman's grandson to one of the daughters of a second woman, unless this daughter was suckled by his grandmother. The fact that the grandmother suckled some of the grandson's paternal siblings does not affect this marriage. Just as it is permissible for a man to marry his sister's sister by lineage, it is all the more permissible by fosterage.