British authors, I love you. I really do. Your contributions to fandom are vital to our survival as a whole and global participation in fandom is wonderful.
But please.
If the character is American. On an American show. Speaking with American parlance.
They will not call their mother mum.
I understand that you guys do and that's fine, linguistic differences are normal and fine and cool.
Until I'm reading a fic where an American character refers to their mother as mum and I have to stop reading for a second, take a deep breath, and completely recenter my mind from the loop you just threw it for.
There are probably American authors who use the wrong words for British things, and that isn't cool either. But I can't speak for them. I'm speaking from my own experience.
Americans don't call our mothers mum. Most people now will use mom unless they're young children, in which case mama or mommy might be used. Of course, there are regional differences and cases of personal preference which will be different, but mom is the most common now.
Thank you for your consideration















