What is this business with Vanessa being a Step-Grandmother?? She is no relation AFAIK (frankly I don't see the point of taking an I-patch to that degree even if it were true, she has no bearing on your blood or your upbringing so it wouldn't be incest).
If she were George's (Grandfather) Sister that would make her your Great-Aunt (or Step-Greataunt I suppose if you have decided George is a Step Grandfather)... Your Step Grandmother would be the mother of a Step parent... Your Great-Aunt's Daughter would be your first cousin once removed
So fun story. That value is what the original I-patch that was already there from the OP has it listed as and not one I changed myself. So if I had to guess, I'd be pretty sure that's what it was before those were split out to be overrides in the first place.
But to be clear, all I've done is combine existing (as in already supported by the code) override definitions from either the main game or the optional side games and then updated values that were listed as safe "acquantance" values to either match what I have already seen in the story (though I just started playing) or what has been shown on the family tree that
ArturiousDesign put together based on the rest of the story that I haven't seen yet. Feel free to change any values as you so desire.