Kinship is the relationship between people created by marriage, birth, adoption, or other rituals.
because it prevents marriage of relatives which people term incest.
Family.
It means the child is being adopted by a close relative to the parents. I'm sure you've heard of babies of minors being adopted by the minors parents and raised as their sibling.
an extended kinship is simply a family with two or more generations live in one household. (ex. grandparents,aunts.uncles.children,and parents)