He wants to have a baby just so someone out there can inheret his estate? Married or not, why is he so hung up on who gets his money when he dies? He won't be around anymore to care! If you marry, aren't you and your children worthy enough recipients? And if he doesn't like that idea, how about a charity devoted to helping children? Or some distant relative?

I'd be cautious about having a baby if that really is all his motivation is. Children need to be raised with much more devotion and attention than the vibe of "I needed you here to carry on my estate" gives them.