blood sister

He had found a long lost blood sister in the village, the mutual recognition being confirmed by the tribal marks.

Say, at the last, what wilt thou call me and in what shape shall I come, Blood-sister?

What scoundrel had taken advantage of an ignorance so profound as to be the blood sister of innocence?

I was now permitted to be on mission with my own blood sister, Sister Cassilda.

Paul saw the tight mouth of the one on the port side: she could have been Pakriaa's blood sister.