My fiance (41m) and I (43f) are getting married next summer. I am a widow, but, from the day I met her, I always called my late husband's mother Mom. She passed in 2021, two years before my husband.

MIL was a wonderful, beautiful woman. My future husband's mom is her polar opposite. She's mean and abusive to my fiance. A textbook case of a narcissistic personality. There is nothing motherly about her, and I do not want to call her mom, even though she is nice to me. Does that make me an awful person?

(Added to note: I am not looking for commentary on the speed between my LH's death and my impending marriage. I don't want to get into the story, but suffice it to say he died slowly so I had a long time to mourn him before he was actually gone.)