同母异父兄弟

例句：

1. 1. He is the only son of his mother and father, but he has a brother who is not related to him by blood.
   他是他母亲和父亲的唯一儿子，但他有一个不是血缘关系的兄弟。
2. 2.The two brothers are very close, as they were born in the same hospital and grew up together.
   这两个兄弟关系非常亲密，因为他们在同一家医院出生并一起长大。
3. 3. The cousins are like twins, sharing the same birthday and often playing together.
   这对堂兄弟姐妹像双胞胎一样，共享同一个生日，经常一起玩。