Hallo, and sorry, I didn't knew where to ask this Q.

I had this Oedipus complex, and I guess my mother was too easy about it; I got more mothers love as child than my sister. Now, as adult children, her need to hurt me is still there, even I several times told her that I am aware of all that and her feelings. Guess she needs to express her anger and make it even. My mother is untouchable, unmistakable, every her wrongdoing is deniable, so she will never validate my sisters hurt.
Sometimes when I 'detect' that my sister is 'here to hurt me', I do my best to figure out what other angers she needs to express (there is also her huge suppressed anger towards my father, who is adult child of an alcoholic).

If only I was able at my age of about 9/10 to tell my mother to share her love equally, my sister wouldn't have this pain now, and wouldn't be so hungry for love.

Anybody have a clue how to make this healthier?
Thanks