直接在sisters的基础上加一撇，变成sisters’，复数形式带s的名词所有格都是直接加’。

Both of my sisters moved even farther away from home

我的两个姐姐都搬得离家更远了。

Anna's strength is derived from her parents and her sisters

安娜的坚强源自于她的父母和姐姐们。

'Two Sisters' is an absorbing read

《姊妹花》的故事情节引人入胜。

Nina's eyes met her sisters' across the table

尼娜与桌子对面的姐妹们目光相遇。

I think it is important for children to have brothers and sisters they can relate to

我认为对孩子们来讲有可以相互理解沟通的兄弟姐妹很重要。