YOU SAID:

my big brothers older brother has an old dog with 4 brothers

INTO JAPANESE

私の兄弟の兄は、4人の兄弟を持つ老いた犬を持っている

BACK INTO ENGLISH

My brother's brother has an old dog with four brothers

INTO JAPANESE

兄の兄は4人兄弟の老犬を飼っている。

BACK INTO ENGLISH

My brother has four brothers, an old dog.

INTO JAPANESE

兄には四人の兄弟がおり、一匹の老犬がいる。

BACK INTO ENGLISH

My brother has four brothers and an old dog.

INTO JAPANESE

兄には4人の兄弟と1匹の老犬がいる。

BACK INTO ENGLISH

My brother has four brothers and an old dog.