Hello
@Jackstar and welcome to the forum. Sorry to hear about your grandson's diagnosis - how old is he?
As others have said, things
will be OK. There will be some changes, but they may not be as big ones as you imagine. For instance, he will still be able to eat whatever he wants, he'll just have to learn how to work out how much insulin he needs for it. As Bruce Stephens said, there will be a bit less spontaneity.
But he'll still be able to live a normal life, and do all the normal activities most people do, and there are very few jobs he won't be able to do (there are professional sports players with type 1 - and we've even had a type 1 Prime Minister). There are people here who've had type 1 for 50 years or more, and complications in well-managed type 1 are very rare.
I'm going to tag
@Thebearcametoo and
@Sally71 as they both have children with type 1 and should be able to give you some reassurance from the perspective of parents.