From organ donation discussions I learned that some don't view brain death as death and only view the cessation of the heart's beating to be death. According to that, if someone's heart was stopped ...
If a widow married the brother of her deceased husband so the deceased husband can have children in the deceased husband's name, then how does the brother have any children in his own name?
Is it ever possible for a Kohen Gadol to perform the Mitzvah of Yibum. After all, every case of Yibum involves a widow which the Kohen Gadol is not allowed to marry?