句子没有问题.这儿的brother's and sister's = brother's bed and sister's bed
英语的代词的所有格是用来代替:my/your/his/her/our/their + 名词
比如:这是你的书,那是我的(书).This is your book,that is mine (my book).
句子没有问题.这儿的brother's and sister's = brother's bed and sister's bed
英语的代词的所有格是用来代替:my/your/his/her/our/their + 名词
比如:这是你的书,那是我的(书).This is your book,that is mine (my book).