An endowment for male descendants to the exclusion of female descendants

Question:
He says: Honorable Shaykh, if a man makes an endowment for his sons and the sons of his sons, and explicitly excludes the children of his daughters, is his will carried out in that case? And is there a flaw in it, that

Answer:
According to the school of thought, it is carried out, yes, as you heard. But according to the correct opinion, it is not carried out; rather, the daughters' children are included because they are among his children and his descendants. If he excludes them, that is his sin. This is one aspect. This matter is referred to the judges; letters in which there is disagreement are referred to the judges regarding the judge's ruling and the prevailing practice.