One inherits neither from birth, wealth, position or any of such things. He has no relations whatsoever with Him except friendship. Any individual who abstains from this path of righteousness has nothing to do with Allah and His Messenger. We are all his heirs for we have taken that path. An individual who follows this path has more blessings than a direct child of his who doesn't.
Human beings have the weakness of loving their children the most.
For Him to have any said of Him would be a blasphemy. In fact, the children of the Messengers have caused a lot of violation to the teachings of the Religion. They have mostly been dignified for the sake of their fathers. Praises be to Him, that He didn't have a child. There were those of his family who were accursed during his lifetime.