Good luck, Twink. I think it's a good idea in theory but maybe it would be wise to approach the granchildren (or their parents, depending upon age) and allow them to give their input before moving forward. I'm just not sure that putting a monetary value on these things is the best idea, even if it's only imaginary. At least if everyone is on board with the idea they'd have nothing to complain about! I've been through this and I know it's difficult to do this in a way that someone doesn't feel left out or cheated.