My younger sister did not look up from her book.

She turned out to be the younger sister of his best friend.

When he was a child, his mother and younger sister died one after the other.

He has a younger sister who is in high school.

He went to the younger sister's room, at the west side of the house.

But I haven't taken on a new younger sister in more than a year.

He can be mean to his younger sister, and even to the rest of the family.

I didn't know he had a younger sister and brother.

She is the younger sister and model of the two.

He lives there with his parents and younger sister, people who know the family said.