Brother and sister both professionals in their 30s call their mother Mummy to her in conversation, in letters and emails and between each other, this is said with a certain awkward little boy/girl voice.
Mother calls them by childhood pet names, daughter is "Honey Bunny". She buys them chocolate advent calendars every December, I could go on but you get the gist...
DH is the son, it all makes me want to yell "Eeeuuuuwwww! just stop now!"
Is this actually odd or is this because they are middle class English and I'm not?