It's really sad reading all this @changinghairstyle .I wish I knew what the backstory is here and I'd love to hear your son's side of the story.
You are getting a hard time on here which may or may not be fully justified, but we can only comment on the picture you paint in your posts - and from what you have said it does come across that this situation is mainly of your making.
Do you think maybe you are overly critical, always complaining about things, always demanding and maybe not be much fun to be around? Sometimes we don't see ourselves as others see us? Yes I get your other children don't seem to have that problem, but maybe they don't like to argue with you, to keep the peace?
Aibu to think they shouldn't expect me to travel all that way with no car and book myself into a hotel when they could just drive down and visit me and I have the room?
The thing is with 3 x 6 years old and younger, including a 1 year old it isn't a matter of 'just' driving down - you are showing no empathy for your son and his family and the difficulties they would have doing that So yes, YABU
I have had to stop working due to my health and my health is getting worse. I'm also not getting any younger.
62 isn't old though and plenty of people of that age with Diabetes and a heart condition and problems with knees and backs still manage to travel. Including me. If you can sit in a car, then you can still travel
I had a close relationship with him until he met his wife and moved away of course my heart is broken.
dh took no interest in the sea before they met but this is still our son's home and we are sad that he doesn't want to visit.
You seem to be blaming your DIL which even if you don't voice it, she will pick up on. You've said a few things which give the game away. She will KNOW! And no - where you live is no longer your son's home. He has one now by the sea.
If you insist in thinking that it is only you who matters in this then you only have yourself to blame if you don't see your son and his family - and you need to be the bigger person and reach out to them. But if you do, you mustn't complain about not seeing them, them moving etc.
I'm sorry to be so blunt, because I can see you are hurting, but you CAN do something about this, if you really want to