Translation of "Joe's" in Chinese

Mary, this is Joe's brother David.

瑪麗，這是喬的兄弟大衛。

I want to join Joe's group.

我想要加入喬的小組。

They were in Joe's class last year.

他們去年在Joe的班級。

It was raining, and Joe's long hair was completely wet by the time he got home.

那時正在下雨，而 Joe 回到家時長髮已濕透了。