My boyfriends baby mama is always getting brought up whenever i'm present, its extremely frustrating.

My bfs family is always bringing up his ex gf,,,,,,,, for example : Oh i talked to blank she said she would be signing up bella for pre school soon !
What can I do in a situation like this ?

HIs mom has mistaken my name with hers!!!!

her name being brought up by his family is torture!! HELP