Chris pronounces “Mom” in a normal way, but with Peter’s New England accent, it does sound like “Mawm.” So I guess it doesn’t make sense, but on Family Guy, not much does.
In the Marx Brothers movie Animal Crackers, Groucho asks Chico to play a song about Montreal. Chico asks what the title is, and Groucho says, “I’m a Dreamer, Montreal.” After some years and many viewings, my brother finally realized it’s a pun on “I’m a Dreamer, Aren’t We All?” I guess it helps that it’s the worst joke in the scene - the jokes about the song about the Irish chiropodist (“My Fate is in Your Hands”) and ‘“Somewhere My Love Lies Sleeping,” with a male chorus’ are much better.