I’m kind of curious about this since reading Into The Forest, a mostly depressing apocalyptic novel about two orphaned daughters who try to survive in their parents’ house after the end of civilization. In the novel, the father was an elementary school principal, and the mother a former ballet dancer, and the daughters are homeschooled due to the remote location of their home. The family’s heritage isn’t specified, but they seem likely to be just average, Anglo, native Americans, if anything can be concluded from the author’s name.
The book’s in the form of a diary kept by one of the sisters, and throughout she refers to her parents as Mother and Father.
I have never, ever addressed my parents as Mother and Father, nor have I ever referred to them as such, except in phrases like “my mother” or “our father”. I’ve never heard anyone do this. Is always “Mom/Dad”, “Mom/Pop”, “Ma/Pa”, or some other colloquial expression. Does anyone here use “Mother/Father”?
I should retract part of what I just said: more than once, I’ve heard mothers get “Mother!-ed” by their annoyed teenage offspring. But not in casual usage.