I've noticed that teachers and midwifes refer to 'mum' and 'dad' as if the people they're speaking to / about are their own mum and dad.
e.g. Midwife says, ''So, what's your name, Dad?'' to my husband.
Teacher at school says to a colleague, ''We'll need to Mum about little Johnnie's behaviour today''.
Swim teacher says to a friend ''I've spoken to Mum about the swimming gala''.
These are all examples I have encountered recently - why do they do it? I find it so irritating and am trying to work out if it's part of their training for some reason, because they all do it.