Do the grandchildren of a father who died before his grandfather inherit from their grandfather, and what is their share, and what is the share of their paternal uncles? And is that affected by the grandfather's health condition and the father's assumption of his responsibilities?

Since your father died before your grandfather, he has no share in the grandfather's inheritance, and neither do you; because the son prevents the grandchildren from inheriting entirely. Your grandfather inherits one-sixth of your father's estate, and this one-sixth is not forfeited by his death, but rather transfers to his heirs. As for your uncles, they do not inherit from your father; because the son prevents the brother from inheriting entirely, and your father's taking care of his grandfather's affairs does not affect the inheritance.