Do the children of the endower from other wives have a share in the revenue of the endowment that he designated for his deceased wife and her children?

If the father dedicated his share in the farm as an endowment (waqf) for his wife after her death, the endowment is invalid because a deceased person cannot own property. In this case, the endowment reverts to all the heirs. However, if the father dedicated his share in the land as a completed endowment (waqf nājiz) for his children during his lifetime, and designated this for the reward (thawāb) of his deceased wife, then the endowment is valid, provided it was transferred to their possession during his lifetime. The condition set by the endower (waqif) must be fulfilled as long as it does not contradict Islamic law. If the endower specified the endowment for his children from his deceased wife and they took possession of it, or if he appointed a supervisor (nāẓir) for it, then it is exclusively for them. However, if possession did not occur and the father retained control of the endowment until his death, then the endowment is invalid. It is advisable to refer to the Sharia court.