One thing though, the game remembers the relationship via the persistent file it seems. When starting a new game, it asks you your relationship to the girls. It'll adjust relationships correctly when answering (step)dad (stepfather doesn't seem to work), but it won't configure anything if you fill in something else (so you may end up with being mentor, and the girls still being your daughters).
I think the Relationship & the 3 Content options should be stored within your save file instead, and when you start a new game you start out with the defaults again?
Another option could be, when starting a new game, the game detecting customized settings, and asking you if you want to reset to default. But still, I think those settings belong with the save.
Note that the game also doesn't ask you for your Sharing preference at the start.