Hisgrandparentsandhiscousinareonthesofa.

His grandparents and his cousin are on the sofa.可以把后面一个his去掉吗？这样句子的意思会不会改变？

His grandparents and his cousin are on the sofa.
他的祖父母和他的表弟在沙发上。

亲，对我的回答满意的话，就给个好评吧。
如果还有不清楚的地方，可以跟我继续交流哦

当然可以，去掉也简洁明了，清爽

His grandparents and his cousin are on the sofa. 他的祖父母和他的表弟在沙发上。

His grandparents and his cousin are on the sofa.可以把后面一个his去掉，句子的意思不会改变。

不可以，因为前后辈分不一样，不符合语言习惯。

可以去，and是并列连词 再看看别人怎么说的。