I’m flabbergasted by this post. I have a pretty self-absorbed and stubborn family member, but even they made efforts to visit a newborn grandchild despite a distance of nearly 300 miles. Three and a half hours is easy!
There are several things that you could do to make this situation manageable:
Take a train to the nearest mainline station, then take a taxi from there. You can book disability assistance and be looked after all the way. I have a relative in her seventies who has gone the length of the country like this.
Book a taxi driver to take you all the way. Ring around and get several quotes. It may cost much less than you think.
Book a self catering holiday home near where they live.
Ask one of your other children to drive you down and perhaps stay overnight together.
Tell your DH that you need him to drive you down at the first opportunity as you can’t go any longer without seeing your son!
But, in terms of your son, you seem happy enough to ‘let him go’ and ruin any potential relationship with your grandchildren, so quite frankly I am not sure that you even deserve him or them.
There are women on here who never had the chance to have a family, let alone have grandchildren. You should be grateful that they are here walking the green earth rather than moaning about where they live!
You have squandered time that you could have spent with them, through being stubborn and stuck in your ways. But there is still a chance to put things right.
Take it, don’t waste it. You could see them this weekend if you really wanted to.