What is the ruling on dealing with brothers who assaulted their father by beating, cursing, and insulting him, and whose visits were cut off due to their mother being in the father's house with the grandmother?

If the children are abusive and disobedient to their father, they should be advised and reminded of their father's right and the grave consequences of their disobedience in this world and the hereafter. If they do not respond, their case should be brought before the Sharia court.

Boycotting disobedient children is permissible if it is due to their sinfulness and transgression. The benefit (maslaha) in such a boycott must be considered. If the boycott leads to their return to righteousness, then it is preferable. If maintaining ties with continuous advice is more beneficial, then that is preferable.