Is it permissible to boycott one who does not pray and commits sins?

Question:
This sister says to me that she has been boycotting her brother for two years, and she says that he does not pray and is a companion of sins. I am asking whether it is permissible for her to boycott him or not.

Answer:
If the brother does not pray, he deserves to be boycotted and cut off, or if he indulges in sins such as drinking intoxicants and being undutiful to his parents, or the like of that, he deserves to be cut off. But if she sees that she should visit him to call him to Allah and give him advice, in case he might respond at times, then there is nothing wrong with it. If she sees this, and if she hopes that her visit will be beneficial through advice, she visits him; if it is beneficial, well and good, and if not, she cuts him off. Likewise, if a man sees his brother not praying or openly committing what is wrong, he cuts him off, except if he sees benefit in visiting him to call him to Allah and give him advice, in case he might respond. However, the parents are not to be cut off. The parents are to be given advice and treated with dutifulness; they are not to be cut off or boycotted, but with advice and with supplication for their success and guidance. This is because the right of the parents is great. The ruling regarding the disbelievers is: