YOU SAID:

your mother is my mother so I guess we must be brothers

INTO JAPANESE

あなたのお母さんは私の母ですので、私たちは兄弟でなければなりません

BACK INTO ENGLISH

As your mother is my mother, we must be brothers

INTO JAPANESE

あなたの母親は私の母親なので、私たちは兄弟でなければなりません

BACK INTO ENGLISH

Since your mother is my mother, we must be brothers

INTO JAPANESE

あなたの母親は私の母親なので、私たちは兄弟でなければなりません

BACK INTO ENGLISH

Since your mother is my mother, we must be brothers