My DD (7) has been asked by my ex to call his partner “mum”. They’ve been together 4 years and from very early on in the r/s my DD was asked to call her stepmum but as they are getting married soon (it’s his third marriage - he’s early 40s!) he wants her to call her mum. My DD told me this tonight and says she’s confused because it’s being forced upon her. She sees her dad EOW and extra time during the holidays so he is a constant part in her life. My ex is a classic narcissist and a serial cheat. I just wanted your thoughts about how to respond to it. I know narcs love the drama and he will know that it will upset me which it does. Should I just ignore?! WWYD?