Congratulations JulieO, how wonderful!
I've been told(by my parents) that one of the great things about being a grandparent is that you can spoil them rotten and then give them back! Also when you look after then you can enjoy them, you don't have to juggle everything else, you drop everything as you will have time to do it later!!!
Have fun being Nanna and congrats too to yoour daughter and partner.