Making Waqf of one’s share in a property

Your question is very vague with minimal details provided. If you mean by your question that the father put up a building,or a block of flats, and the son, thereafter, purchased a share in the block of flats and donated (i.e. made Waqf) a portion of his share (during his lifetime) to the poor, then such a Waqf will be valid and in order, even though the flats may have been in a joint partnership between father and son.

If he didn’t make Waqf of the block of flats in his lifetime, but left a bequest that a stipulated portion of his share must be made Waqf to the poor, then such a bequest is also in order with the proviso that it doesn’t exceed one third of the entire estate.

If the scenario is other than what we have explained above, then feel free to forward the details and we will respond accordingly Insha’Allah.