Do you qualify for a pair of slippers and a cardigan now?
Seriously though, if the experience of people I've known is anything to go by, there's a few years of hard work ahead, after which things will find their own groove.
At the end of the day, UselessBoy(TM) will be history and you'll have a wonderful grandchild whom you can spoil rotten, as is the ancient and unswerving right of grandparents so to do.
My very best and warmest wishes to you and your family - it sounds like you're a strong bunch.