My mother's son is my cousin这句话中哪个地方错了?

My mother's son is my cousin这句话中哪个地方错了?

son 改为 brother的啦

我妈妈的儿子当然是我呀。。。

还有问题可以问我~~

你妈妈的儿子是你堂兄弟就悲催了

我暂时保留我的看法！

My mother's son is my brother .

My mother's son is myself.
My mother's brother is my uncle.
My mother's brother's son is my cousin.