Just found out that I have a half-sister out there somewhere........

i have a similar story to yours in that I recently found out I have a half sister. My father had a child out of wedlock 3 years befor I was born. He then left that woman and married my mother and had me. He never spoke to the woman or his child after my sisters 6th birthday. She found us last year but My mother was VERY upset at the though of me, my brothers or father having a relationship with my sister so we left it alone until this year in which i started speaking to my sister and we have had a very Rocky relationship since then. I would like to start a support group with people similar to me and maybe we can help each other adjust to a new sibling in our lives and also the resentment they feel towards us for being the child or children that were raised by the parent.