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Although you can't assume that your fiance will be like your dad, the fact that you're worried about it makes me wonder if you're not really ready to marry this guy. Have you had any pre-marital counseling to find out more about him? You don't want to discover things about him that bother you AFTER you're married and he's your child's dad. There are a lot of resources out there designed to help you get to know the guy you're engaged to marry, and any good counselor will help you discover those things that may be a concern. Hopefully that will ease your mind about your child and future together. I wish you all the best!