Great contest James!!!!
I was going to jump in but after doing my calculations and then reading some more of the thread I see I am totally off base!!!!

I figured you had your first born at 20 years old and then the second at 22 and the third at 28. This would make your younguns 43, 41, and 35 respectively. Then I tried to figure the ages of their little ones with the info you gave us. I figured the 43 year old had the 13 year old grand child and the 35er had the one year old. Then I just guessed at the ages of the other siblings and I came up with 12 and 10 for the 41 year older, and 10, 8, and 5 for the 35er. That would make my guess of the total of the ages of all you grand kids 59, which I know is wrong because it's not one away from any of the numbers the guys chose in the first 10 posts!

Whew!!!
How far off are my calculations James???
Take care everyone and I hope you all are with family and good friends!!!!!