An old lady I visit (age 84) with my volunteer work is called mummy by her four children, all girls and aged 60 down to 53.
This sounds so wrong. At their age it surely should be mum or one of its dialectic derivatives - mam, mem, murm - I am keeping away from ma, mammy, mama, which are heard a lot less nowadays, and of course, mom.
Mummy, when said by an adult just sounds so twee, well that's what me mem said.
Thoughts.