我有一个哥哥。

Wǒ yǒu yí gè gēge.

I have one older brother.

他是我的哥哥。

Tā shì wǒde gēge.

He is my older brother.

我哥哥比我大两岁。

Wǒ gēge bǐ wǒ dà liǎng suì.

My older brother is two years older than me.