Boycutting relatives who are negligent in prayer

Question:
I have relatives who are negligent in prayer and do not attend it in congregation. The women of each of them expose themselves to their brother, or to the other, and they do not accept advice. Is it permissible for me to boycott them?

Answer:
You should advise them and guide them to good, urging them to pray in congregation and to restrain their women, for a woman is an 'awrah (part of the body that must be covered) and she has no right to expose herself to her husband's brother, nor to her husband's uncle, nor to her husband's maternal uncle. Advise them for the sake of Allah, direct them to Allah, enjoin what is right, and forbid what is wrong. If you see that they do not benefit from it, boycott them and cut them off; there is no harm in that. The majority of scholars hold that these sins are a religious innovation (bid'ah), and some of the prophets said it is obligatory. However, if you hope that Allah will benefit them through your advice, then persist in advising them and be patient and steadfast, perhaps Allah will guide them through these means, and that is sufficient.