Gay man told to marry woman or lose inheritance

A fascinating, and somewhat confusing, article about father's will requiring his son to marry a woman (specifically, the boy's mom) lest the son's child not receive any inheritance from the grandfather. From ABC News:

The words "child," "grandchild" and "descendant" include natural and adopted children and children born out of wedlock, according to the will, which was filed in Manhattan Surrogate's Court.

"However, such words shall specifically not include an adopted child of Robert, if adopted while Robert is a single person, or a biological child of Robert, if Robert shall not be married to the child's mother within six months of the child's birth," the will states.

Robert Mandelbaum is challenging the will on the basis that it would require him to enter into a "sham marriage" which would violate New York marriage-equality law.

I don't remember from law school if racist provisions of wills are enforceable, but I doubt it. If not, I would think this would fail along the same lines, since NY state has marriage equality laws.