How should I feel?

[giveahoot22]

I know this may not be the place to talk about something that is annoying me beyond words but I can not help it.
You see I still live with my mother and though we normally get along great lately it seems she hates me.

Alright I will make a long story short, almost two years ago -two years in January- my sister got divorced from her husband who was cruel and a bad drunk, my sister has since got into church and has received the Holy Ghost.
Ever since she and her ex-husband separated my mother and I have been helping my sister keep her house clean, we have took up the chore of all the cooking and doing everything for the kids.
It is like we are the second parent to the children.

I know this has created a lot of stress for my mother but I believe and I feel she has no right to take out her anger on me since I am the only one who helps her look after my niece and nephew as help care for my elderly grand parents.
I am so annoyed that everyday she says I am useless and that I do nothing right.

I can not help but rant about it for I feel so horrible that I am unable to help her.
I feel that I am nothing but a failure to her.