Exactly what I was getting at with the 2nd half of the post, and im pretty sure (by paterons rules) that MC can not have been legally related (adopted included) to Jenny/Tiffany at ANY POINT. Logically after his dad died as a child his fathers family friend took him in illegally, enrolled in in schools and other things (such as medical) without providing ANY sort of legal documentation
But it totes makes sense shes not realted and their realationship holds up fine without the patch
Edit: honestly curious how people will spin this to try to agure that incest wasnt the initial intention without saying "no think because porn logic" to the same game where every update there are always people talking about "useless" (non sexual) animations that make the game feel more "real/lived in"