It is incest in some parts of the world though including some states in the US
Of course, this was under the assumption for the US. This is news to me for step-family members being considered incest if any marriage is pursued. However, I do recall that there
aren't any consanguinity laws prohibiting step siblings from being married; unless there have been some recent changes. Obviously, step siblings isn't the same as step-parents, but I'm not sure if it's the same for both.
That's besides the point. I was just showing props to the game for making a desireable MILF. Regardless, this game is great.