What is the ruling if the adult wife's mother breastfeeds the minor girl with the adult wife's milk?

Primary text

The marriages of both the adult wife and the minor girl are nullified because they become sisters through fosterage. If consummation had not occurred with the adult wife, the man may marry whomever he wishes of the two, and he may reclaim half of their dowers from the foster mother. If consummation had occurred with the adult wife, he may marry the adult wife because the minor girl is not in a waiting period (Iddah). However, he cannot marry the minor girl until the adult wife's waiting period concludes, as the minor girl has become her sister, making marriage impermissible during that period.