New sister. Now what?

Dear Dawn,I just found my birth father last week, the day after Christmas. I was given up for adoption two days after I was born. Him and my bio mother were very young and not together at the time of my birth. When he found out I was born she told him I had died during birth. He didn't even know I existed. I matched with a first cousin on myheritage.com and hes the one that helped me and my father connect. We are actually meeting in person this next weekend. Every moment since the night he found out I existed he has told me he loved me and his wife and him cant wait to meet me. I know I have 3 sisters from his side. I haven't asked much about my birth mother yet except her name. I had a very wonderful life with my adoptive parents but they are both gone now. My real father wants to be a huge part of my life and I'm ok with that. I hope that it doesn't upset my sisters like it seems your upset, which I don't understand. He wants to make up for not being there, know me and my life that were taken from him for all those years. I don't expect to be showered with gifts but if I am I hope my sisters don't feel the way that you do. Look at all the years they have had him, a few extra gifts or visits or time with me shouldn't be so upsetting. Maybe I should be the angry one that I missed out on knowing him and being a part of his life and they got that joy. I am going to embrace my family, I hear its a very large one, and whoever gets jealous of my relationship that we were both cheated out of can kick rocks. Its so selfish and rude to feel that way. I hope that I can have a great relationship with my sisters as well. I have been an only child my entire life. If not, at least I have my dad and "mom" now. He is MY DAD as much as he is THEIRS. I can't even believe you thought she would just "walk away" from her dad after finding him. I will pray that you find love in your heart for your family instead of this resentment for a family member that just wants to be included and loved they way you are.