My Inheritance

My mother died when I was 12 (cancer), I've no siblings and my father remarried when I was 20. His new wife had a daughter then 13 and she was quite shy around me at first, fast forward 5 years our parents both died in a car accident with a truck. I was left everything as my father hadn't updated his will or adopted his wife's daughter. The daughter inherited some money from her mother, but it wasn't enough for her to go thru college. Her first year was already paid for by my father, with his and my stepmother's deaths I thought it was up to me to follow their wishes and support my stepsister. Which I was happy to do, we still lived together neither of us had thought about separating after the funeral. My stepsister is very reserved not outgoing at all, I was the only male she talked to freely other than my late father. During last Christmas we went skiing as the family always has done, rented our own cabin as usual. Skied together as always, one thing led to another and now my wife (stepsister) is pregnant to me. We married in March after she tested positive according to the doctor. We'd kept sleeping together on our return and I was quite happy she got pregnant, and she says she is happy to be pregnant. I think it would be approved of by our late parents.