Family Survival Rules in the Apocalypse

In the end of the world, a little person becomes the family ancestor. My descendants are better than me, so what's the point of asking me to pass them on? If my descendants are not as good as me, what's the point of asking me to pass it on? We are mortals, but the world forces us. I have the system in hand and the world, but... What happened to the reborn descendants. And that one... Suddenly the whole body is so tall and shining with gold, what's going on? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.