You're not child-free mate. Grow up. You have a child. A child with disabilities. Yes, you didn't bring her up for the first 8 years of her life, but since her non-bio father decided to abandon her, its now 50% your responsibility to step up with the mum. Even if you didn't know the child existed and just found out (but you knew all along) she is still your child, your responsibility. If her mum dies, are you just going to let her go into a child home/ foster care (not many people willing to adopt a child with disabilities). Just step up man, and help the mum out with your own child, I'm sure she's not going to expect too much from a loser who thinks like you, maybe some child payments and some weekend outings, maybe a hospital appointment or two. You wasn't raped, you had sex freely (even if you didn't know she was married) and the result is you now have a living breathing conscious suffering child.