Translation:I am his mom, the other is his aunt.
Errr, no... I'm from a town in The Midlands near Birmingham, and it's written 'Mom' here as well as pronounced that way. Similarly, in parts of the Northeast, North and Northwest, 'Mam' (spelling and pronunciation) is often used. It's not a mispronunciation, it's just different.
Part of my point was, with English accents, "Mom' here as well as pronounced that way"/"'Mam' (spelling and pronunciation)" simply don't work as pronounciation guide, because the way you pronounce Mom or Mam depends on the region in the first place. Nothing to do with mispronounciation, that's how accents work in the first place.