YOU SAID:

this is my moms horse that I ride

INTO JAPANESE

これは私が乗るママの馬です

BACK INTO ENGLISH

This is my mom ’s horse

INTO JAPANESE

これは私の母の馬です

BACK INTO ENGLISH

This is my mother's horse

INTO JAPANESE

これは私の母の馬です

BACK INTO ENGLISH

This is my mother's horse