Im so sorry to hear what you are having to deal with, and I hope what I have to say will help some.
Im not taking up for you mom, but I feel from reading what you wrote that maybe she does what she does because your sister is so emotionaly unstable. As mothers we tend to give all our energy to the ones that need us the most. Im sure she doesn't mean to leave you out, but she see's you holding it together. Also your mother is most likley scared to death for your sister, and may also be scared of things that your sister might do. I think instead of fighting agenst your mom, try sitting down with her and tell her, hey mom this is how I feel, however I want to be here for you, because I can see what this is doing to you. I may not always understand, but I want to be a help in anyway I can. Tell her that sometimes you feel like you are really left out in the cold. Now don't make her feel that you are blaming her, just let her know you need her to.
She needs you also, she already has one person in her life that is a basket case, Moms aren't made of steal, we break to, we just have to put up a good front.
I would also say to you, start a journal, and write all you are feeling down, also make it a point to find some you time.
Try not to feel so bad at your sister, I know she has put you all through a lot, but realize she has a very serious problem and she needs some very serious help, but at the sametime don't let yourself be a door mat. I hope what I have said makes sense and helps you.
Oh and one more thing I don't know what your faith is, but trust me when I tell you there truley is power in prayer. Talk to God he will listen.
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