"However things were between my sister and me, I have to find out what happened to her."

"There seems to be little love lost between you and your sister."

If there's something like that between you and your sister, it would help me to know.

The tension seemed to break between my sister and me.

She tries to find out what is going on between him and her sister.

One of which making him decide between his sister or the animals.

The movie deals with the relationship between a brother and his sister.

The film focuses on the relationship between a brother and sister.

He remembered it had been like that between him and his sister.

"Surely you don't believe that my mother would have wanted to come between a brother and sister!"