Why is it Always Me She Turns on and Never Siblings?

My mom is now 83. I am 60. For the past 15 years I have been her main caregiver because I live closest. My husband works 6 days a week and on his only day off we visit my mom so that he can help with the odd jobs that need doing for her.

I have 3 brothers who only see mom occasionally due to distance, etc. I also have 2 sisters who would visit when it suited them, happy to let me do all the work and keep them informed. For the past few years my mom has been in and out of hospital with various problems. I have dealt with all the trauma attached to this - certain medications affect her mind and make her prone to confusion.

I have frequently been subjected to her verbal attacks both when she is in hospital and when she is perfectly well - it's my fault she's in hospital, I'm not visiting enough, I'm speaking to the nurses and telling them lies about her, etc., etc. In the latest outburst, I have been accused of hiding her mail and her bank statements and numerous other things that I would never do.

I fully understand when it's the medication talking, but this is not always the case. What I can't understand is why she never talks to any of my sisters in this way - why is it always me? If I mention it to them, they tell me mom is always fine with them and imply that it must be me! I now have health issues of my own and am too tired to deal with it all. I have stopped answering my mom's calls and am not visiting at the moment.

Strangely, I don't feel guilty about this as I feel I have always done my share. Now I am starting to feel guilty about not feeling guilty. Is this crazy ??