Well it depends on who is present in the room and if I'm talking to them or about them...
If it's to them then I use their names, if it's writing a card then OH writes it to his Mum/Dad etc. and signs our names but I'm not on good enough terms to call them mum and dad
If it's to them then I use their names, if it's writing a card then OH writes it to his Mum/Dad etc. and signs our names but I'm not on good enough terms to call them mum and dad