Does Zakat have to be paid on money saved for a son's marriage, from the profits of which the mother and son are supported, knowing that the father does not provide for his needy son?

Zakat is obligatory on saved money if it reaches the threshold (nisab) of 85 grams of gold and a full lunar year (hawl) has passed on it. The amount due is one-quarter of one-tenth (2.5%). It is not permissible to give zakat to one's son, because his maintenance is obligatory upon the mother. Zakat is a blessing and growth for wealth and a purification for the soul.