Congratulations!!
Grandchildren are sooooooo much fun!!! I have five (4 granddaughters and one grandson). We started out with three granddaughters in four months. My son and his wife had twin girls and four months later my daughter and her husband had a daughter (on my birthday!!)
It was quite interesting when the girls were small. The twins got so much attention that my daughter would get upset. I always tried to make sure that all the girls got the same amount of attention. After a couple of years we got another granddaughter and a couple of years after that we finally got our grandson. The girls are all in school with 3 in the third grade and one in kindergarden.
We had a big snowstorm here last week and everyone came to Grandma's to go sledding and play in the snow. The house always becomes instantly alive as soon as they all come in the door. I love it!!!
You have so much to look forward to. Enjoy!!!