Attack of the dinosaurs!

This is better, I've decided that I don't like posed children's portraits, shooting them playing with their toys in their natural environment gives a much better photo...

I'm doing a family shoot with the grandchildren for my mums Christmas present this week..
13, 11, 9, 3, 3 and a hyperactive 2 year old.. Any tips before hand would be greatly appreciated

I've considered drugs but not all of the mums agree!!