blood relation
blood relative
cognate
sib

Even, or especially, when they happen to be blood relations.

Do you know that he and I are blood relations?

There was little enough to leave and, as I said, they were no blood relation.

Thus, it seems natural to love one's children, to respect parents and to share a house with blood relations.

I'm the only person who was a blood relation to Christian.

"You told me he was some kind of blood relation."

She calls him "father" but there is actually no blood relation between the two.

The fact that you and she are blood relations, for example.

They none of them arc my flesh and blood relations.

This family, like almost all joker families, had nothing to do with blood relations.