DS2 is Nutbag.
DD2 is Pagey (said padge-ee)
DS1 is Dribbly
DD1 doesn't have a nickname, but if she's a bit whingey I'll call her Precious.
DH is Pet, I love the old Michelle and Ferret skits so it will be "Pet I said Love I said Pet I said Darl" LOL

Sometimes when we are meeting new people and the kids are all with us DS2 will introduce himself and his brother and say "I'm Nutbag and he's Dribbly"