You’re not being unreasonable at all. I have much the same problem with journeys of 4hrs, 2hrs and 90 minutes to see my 3. I struggle a lot with disabilities too. I’ve tried talking to them but nothing changes. I have good relationships with them and am very welcome at theirs. The only thing you can do is to put your case over then leave it at that. Try to accept that seems to be the way many of the younger generation are these days, and know that you are far from alone in this frustrating and difficult situation.