Is it prescribed for a woman to uncover herself before her brother through breastfeeding?

Question:
I heard a shaykh say: The questioner asks, "If a brother through breastfeeding does not pray and signs of open sinfulness and immorality are apparent on him, is it permissible for him to enter upon his sisters through breastfeeding? And should they uncover themselves to him or veil themselves from him? We ask for clarification. May Allah reward you with good."

Answer:
He should be boycotted, even if he is a brother by blood. He should be boycotted if open sinfulness, disobedience, and abandoning prayer become apparent, even if he is a brother by blood, not just through breastfeeding. Even if he is a brother by blood, he should be boycotted if he does not accept advice, saying, "Do not seek to replace me with another, as long as you do not pray and signs of disobedience and abandonment are apparent." Yes, he does not give his sandals to his brother through breastfeeding or his brother by blood, until Allah guides him, until he repents, if we are able to do so.