>>29778452some islander cultures actually refer to respectable women as mom or whatever native equivalent. Example, in New Zealand the maori word whaea (mom, aunt) is used for female teachers and for men they use pa (father).
besides that, does she actually have a name besides mom? If not I guess it's because she's the mother of the mc and is presumed to be called whatever you decide. GF didn't allow naming so her default name is mom when other npcs refer to her.
