YOU SAID:

My mother has a brother who has a mother who has two brothers with two sons who are also brothers

INTO JAPANESE

私の母には兄弟がいて、母には二人の兄弟がいて、二人の息子も兄弟です。

BACK INTO ENGLISH

My mother has a brother, my mother has two brothers, and my two sons are also brothers.

INTO JAPANESE

私の母には兄弟が1人、母には2人の兄弟がおり、私の2人の息子も兄弟です。

BACK INTO ENGLISH

My mother has one brother, my mother has two brothers, and my two sons are also brothers.

INTO JAPANESE

私の母には兄弟が 1 人、母には 2 人の兄弟がおり、私の 2 人の息子も兄弟です。

BACK INTO ENGLISH

My mother has one brother, my mother has two brothers, and my two sons are also brothers.