Are the husband's family members sinful if they encourage and urge him to divorce his wife, given the continuous problems and mistreatment he suffers from, knowing that he is hesitant to make this decision because of the children?

If the wife is disobedient (nashiz), the husband should strive to rectify her. If she does not respond, then he should consider his situation: if there is a preponderant benefit in keeping her, then he should keep her; otherwise, there is no harm in divorcing her. There is no objection to encouraging him to divorce her if she does not become upright. A severe warning has been reported for the wife who angers her husband, and it is not permissible for the mother or anyone else to corrupt the wife against her husband.