Welcome to the club, Leon, fantastic news. It gets even better as they grow. I have just one grandchild, a granddaughter, who is just over five years of age. Once a fortnight or so we get to look after her for a day - though she's off to school next year, so I guess that's going to stop - which is a load of fun (especially when her dad picks her up in the afternoon/evening).
While it can be very, very, tiring I wouldn't have missed the experience for quids. Congratulations to his parents, Leon.