I've name changed to post this and have only read the OPs posts.
I found out my Dad had another child after he died, it's made me question everything about my life and has caused a lot of heartache? Please don't do that to your wife and children, don't let them find out when your not here to answer for yourself, they will feel like you didn't care about, and you won't be here to say they did.
I did end up meeting my sister but sadly it hasn't worked out, not because of the 11 year age gap and we don't have any bad feelings about each other but both have issues about what my Dad did and I think being in each other's lives stopped us from moving on. I don't know how to word it, but my sister is happier without me in her life, and I totally understand why because I find it upsetting too but in a different way.
she had a lot of questions about Dad and my db and I were the only link to him she had, and because of my anger at my Dad, I couldn't answer them in an unbiased way, I wanted to tell her he was a lying cunt and that walking away from her was probably the best thing he could have done for her, that she wasshe's better off without him, that I feel guilty for what he did and it's really not fair of me to put that on her when she's dealing with her own stuff. She wishes she had my life, and sometimes I wish I had hers as maybe I wouldn't be hurting so much if Dad fucked off out of my life as a child too.
My stepmum knew about my half sister, dad had a FWB thing with one woman while starting a relationship with stepmum, stepmum had asked my Dad to walk away from his baby as she didn't want to share him, she wanted him to be a Dad to her son and for the three of them to be a family, my Dad agreed and set up a cosy home with his wife. I genuinely think he'd have dumped my brother and I as it became clear after his death she didn't want us around either (there's so many things I could post) but as we lived near his Mum he had to put a bit of effort in and visit us sometimes.
My sister knew about me all her life, her mum told her about us, about her Dad and about why he wasn't in her life and while she knows my Dad lied to me, she feels angry that my Dad was involved in my life and not hers, and as he was coward and pretended she didn't exist, she never got to ask "why?", why wasn't she allowed to have her big sister and big brother in her life. Dad apparently told her Mum that he'd tell us about her and that he'd give us her details once we were old enough to understand so she thought we didn't want anything to do with her like my Dad.
My Dad played the doting husband to his wife, (my stepmum) and the doting father to her son. He wasn't the best Dad to my brother and I after he left my Mum, he's spout off and be all judgey about people sleeping around, about people who out themselves before his children, about men who don't treat their children equally and he was the biggest fucking offender. Sometimes I hate him for the things I've found out, for hurting me, for hurting my brother and for hurting my sister to make his own life easier.
He died suddenly and Everything happened so fast with lots of secrets coming out once he wasn't around to shut his wife up and his brothers and sisters saying they didn't tell us certain things because they didn't want me to be hurt.
Yits your elder Daughter also a secret from the younger one? You haven't mentioned how you explain to her why she can't meet her older sister. Fwiw I don't think it'll be the age gap that prevents them having a relationship, it'll be your choice to keep them apart, both Daughters coukd feel like a dirty secret if the younger one doesn't know. If she does she could be hurt that you don't think she's worthy enough to know her older sister.
Then there's your poor wife. You're taking away her right to choose to forgive your cheating, the longer you leave it the more likely she will be to leave you. The longer you lie, the more damage you will.
I don't think you were weak, I think you were selfish. You chose to have unprotected sex outside of marriage, you chose to go back to her room, men who love their wives would have made their way to own room, you chose not to that, not because the woman had some magical power over you and made you do something you didn't want to, but because you out yourself first, and I dint think you are weak now, I think you dont want your life turned upside down, you don't want to start again on your own, deal with the hurt youve caused and are choosing to deceive your wife and daughters instead.
They will find out, you have the choice for them to find out while you're alive and can answer their questions so that they can at least have some answers, to let your wife make an informed choice about being with a cheating partner, or you can choose to hurt them further and let them all find out about each other after your death and have them all think you never loved them and carry hurt and unanswered questions about with them for the rest of their lives.