blood sister

I never seen her, but she's Johnny's own blood sister.

It is unknown if she is the blood sister of Rudolf.

At one time, she and the Reverend Mother were closer even than blood sisters.

And dearer to me than any blood sister could ever be.

We're very different as players, but together the combination of being blood sisters and chamber musicians is like playing with your shadow.

"She is much too beautiful to be a blood sister of yours!"

Make a pact with her and become blood sisters?

But Ronnie understood: Alice did not want to be her blood sister.

In the lyrics, Farmer addresses this death woman as if she was her blood sister.

We are in the most literal sense blood brothers and blood sisters.