Is grandpa filial outside or inside?

Generally, after the parents of both husband and wife die, it is called filial piety. Filial piety means that mom and dad are related by blood at both ends and have no relatives within five generations. Metaphor grandparents, grandparents, uncles, aunts, uncles, aunts, uncles, menstruation, and grandparents' relatives, grandparents' relatives, etc. are all filial after their death.