HAL9000
Lifer
Of course he HAS children, 2 in fact. He never HAD children. That only a woman can do.
Your arguments are acting like fathers take some active part in gestating a child. They do not.
So if you were to die, the father that currently has children would change to a past tense, and the past tense of has is had. Therefore your father would have had children.
Had != Given birth to.