We've got all sorts of funny little names for various different family members.
My gg grandparents were called Old Man and Old Woman by the family
GG aunties have all sorts of funny nick names (Bussie - because she wore a bussle, Flick Eye because she winked at people, Kittens because she liked cats and Dushie (although noone knows why!).
Other nick names include - Dick (for someone called Harry), Cooz (for someone called Tom), Bunty (for a William).