Am I reasonable to become angry at being ill-treated if I am the sole heir?

I have been the caregiver of my mother for nearly a year. She shouts at me, complains while I'm trying to do my best, sometimes treats me like plain garbage and sides with my other siblings over me. On the other hand, I know she has me the sole heir to her home as well as her bank account and is really leaving nothing to my other siblings. So my question is am I being petty when I get angry and frustrated at the fact that she treats me so bad? Should I just accept this treatment and stop complaining since she is leaving everything to me and nothing to anyone else?