Should I tell my mom about sexual abuse from my brother when I was a kid?

I've pondered this for a while now, and would like to get the opinion of others. I am now a 27 year old mom of 2 (boy and girl) and this happened many years ago. I have 3 older brothers, the eldest being 16 years older than me and the other 2 are twins that are 5 years older than me. My father and 2 other brothers are wonderful, loving men who never did anything wrong to me, but one of the twin brothers started sexually abusing me when I was 5 years old on up to around 10 or so. I was always too afraid to say anything to anyone. Never penetrated me, but did expose himself and try and get me to touch him, dirty talk, fondling me down there and laying on top of me moving up and down. It always made me feel ashamed and I never did get up the courage to tell much of anyone other than my friends and even they acted like they didn't believe me. I was also sexually abused in the same manner by a few male cousins of mine. I've been suffering from depression and an eating disorder that has all but consumed my life and suffered from alcholism for quite a while (recovering alcoholic). I'm wondering if some of it could be indirectly caused by the fact that I never shared this with my mom, dad, other brothers or anyone else in my family. My other brother (the other twin) revealed that he was sexually abused by a neighbor as a child and now my mom acts like she gives him special treatment because he "suffered such a traumatic thing in his childhood" (which he did) but, what about me? I'm left wondering whether I should tell her or not. The guilty brother has been reclusive these past few years and having issues with his nerves, as I do, but he has a beautiful young daughter that comes to visit him sometime and it makes me worry for her because I don't know if he's changed now that he's an adult. My Mom loves him to death and puts him on a pedestal so-to-speak because he's intelligent/successful, etc.. If I were to tell her, I've no clue HOW she would react. What whould I do?? Mean-spirited comments will be reported. Thanks for any advice/support.