family member
Том для нас словно член семьи.
Tom is like a member of the family to us.
Раз уж я член семьи, то я голосовал против этого.
Since I’m a member of the family, I voted against it.
— Любовь – болезнь (2017)
He’s, so to speak, a member of the family.
You’re almost like a member of the family.
He's like a member of the family.