Wow.. i guess you really are old!
Sincerely, congratulations with the gift of a grandkids..
my father in law said to me...:
Wife, work, house, kids, all those things are like the main course of life, but grandkids....-thats like lifes desert!
And just be happy that you're still so young when you get them, cos then you still be able to play with your grandkids, and see them grow up..
And best of wishes to the parents as well..