(one's) (own) flesh and blood
One's family member(s). You're my own flesh and blood—how you could you steal my story idea? She's our flesh and blood, so let's all try to get along with her while she's in town.
your (own) flesh and blood
near relatives; close family.your (own) ˌflesh and ˈblood
a member of your own family: How can I possibly not help him? He’s my own flesh and blood, isn’t he?