Does the endowment I pronounced include the father's share of the inheritance, which he promised to transfer to my ownership before I pronounced the endowment, or does it remain his property and not fall within the endowment?

If the questioner declared his share of the land inherited from his mother as waqf (endowment), then it has become a waqf if he was competent to donate (sane, adult, acting voluntarily, not interdicted). As for the father's share of the inheritance, it did not enter into the waqf because it was not part of the questioner's intention, and the gift was not completed with its conditions, which include possession. Furthermore, the questioner did not originally issue a waqf for his father's share. The majority of scholars stipulate for the validity of a waqf that the endower must own the property at the time of endowment. Therefore, the waqf is limited to the questioner's share and does not include his father's share. The father should treat his children equally in giving, unless there is a legitimate reason.