YOU SAID:

my mom is your mom and his mom is my mom and your mom is his mom

INTO JAPANESE

私のお母さんはあなたのお母さんであり、彼のお母さんは私のお母さんであり、あなたのお母さんは彼のお母さんです

BACK INTO ENGLISH

My mom is your mom, his mom is my mom, your mom is his mom

INTO JAPANESE

私のお母さんはあなたのお母さんです、彼のお母さんは私のお母さんです、あなたのお母さんは彼のお母さんです

BACK INTO ENGLISH

My mom is your mom, his mom is my mom, your mom is his mom