DH family all go in for nicknames and have done for generations. Mine not so much as DM thought nicknames very silly. Our DC have pet names for each other which is quite endearing.
DGC are given nicknames by their parents which I never use but I accept.
A niece couldn't pronounce Siobhan so she calls her auntie phone - which turns out to be rather appropriate.
How can I stop people from 'helping' ?
Engagement Party and then Hen Party
Small things that make you feel happy

