foster-sister
foster sister

In 1899, she killed her foster sister Elizabeth with a dose of strychnine.

He takes odd jobs for money, which he uses to support his younger foster sister and himself.

I was thinking maybe we could sort of be foster sisters to each other.

Tell me more about my rights, foster sister.

That would be a turn up for the books, wouldn't it, if my uncle married your foster sister?

What would she think of her foster sister coming here like this?

You could have been one of my foster sisters.

My foster sister could tell you more about them.

Earlier today, while going through the victims' papers, I discovered my foster sister was adopted.

You would always feel that you were their foster sister.