What is the ruling of the judiciary in a case where a father refuses to support and house his adult children (a university student daughter and a high school student son)? And is he compelled to provide for their maintenance?

Adults are not subject to custody and have the choice to live with whichever parent they wish. The majority of scholars hold that a father is not obligated to provide for his adult son unless the son is incapacitated. However, the Hanbalis maintain that the father is obligated to provide for his son as long as the son cannot provide for himself, even if he is healthy and strong. This is our preferred view regarding the maintenance of daughters. It is permissible to refer the matter to a judge to compel the father to provide maintenance. Children are obligated to honor their parents, and part of this honor is to advise them, enjoin them to good, and forbid them from evil gently and courteously, such as advising them to stop drinking alcohol.