If it's any consolation Linda you're not the only one feeling like this - I have just the one sister and when Mum was alive and I was caring 24/7 she used to 'generously' give me two 3 hour breaks a week - 6 hours out of a 168 hour week
To arrange a weekend away, took major planning at least 3 months in advance.
Now that Mum is no longer here, I get the impression that my sister thinks I'm a nuisance when I need to talk - most of the time she ignores my existence unless she wants something. Quite frankly my attitude at the moment is 'to hell with you'
It's sad really because at one time we were very close and over the years I've done all I can to maintain that closeness, but her self centred attitude is really beginning to get to me and has destroyed the relationship we once had
Luckily I'm close to my nieces and their families - but they lead such busy lives that I don't see them anywhere near as much as I'd like.
So ((((((((((((hugs)))))))))))))) Linda and try to keep your chin up - you're doing a great job