Well about 2 weeks ago I found out that I have a 30 year old sister that I didn't even now existed I found out by reading a letter she sent to our father he has never mentioned her or anything he still doesn't know that I now about her and I'm now having to hide the fact from my brother I just feel now that my entire life has been a whole lie and the fact that my father and I haven't always had the best relationship I'm wondering if the fact that he had a secret daughter is the reason why I have never felt that close to him do I just remind him of her ? I'm very close to my brother and keeping this from him is killing me but now only that do I reach out to her knowing she's out there and is my flesh and blood I don't now whether I can keep my distance any advice would be amazing.