Related על בבא בתרא 283:1

A convert that died and Jews divided up his property [if he has no children, since he has no legal connections to his Gentile family], but afterwards it was known that he had children or that his wife was pregnant—all of them [the Jews] are required to return [the property they took]. They returned everything, but his sons died or his wife miscarried, anyone who held possession [over his stuff] the second time keeps it, but from the first time does not.