Inspired by a recent thread where the poster typed 'mum said XXX, dad said YYY', mum did XXZ, dad did YYY, all the way through a really, really long thread.
I've always said 'my mum, my dad' unless speaking to my brother or sister, because of course - my mum isn't your mum and I want to differentiate!
Sweeping generalisation but I have found that people who don't do this tend to be very insular / self focused. Stop saying 'mum' to me - it's not my mum!
How do you refer to your parent outside of family?
'