Is a son's refusal to financially assist his father, when the son is well-off and owns property, considered an act of disobedience to parents (ʿuqūq)?

A father may take from his son's wealth what he needs. As for anything beyond his needs, the majority of jurists hold that he is not entitled to it. The Hanbalis, however, are of the view that he may take even if he has no need, provided that he does not cause hardship to the son's wealth, that he does not take what the son needs, and that he does not take in order to give to another son. Accordingly, if you need the amount your father requested, or if his taking it would cause hardship to your wealth, you are not obliged to give it to him. Nevertheless, it is preferable to obey your father and agree with him, as long as the money is not spent on something unlawful, or if doing so would lead to your ruin or the ruin of those you support.