Who cares, let him ask if he wants. The game already has incest in it so adding more wouldnt be hurting anyone, theres these things called incest patches for a reason.
I find asking after stuff and seeing what people want much more useful than saying 'if it happens, it will take 5 or more years'. Personally I hope the game will be still get new stuff even in 10 years, as long updates will not come faster. What may never happen. So time is not really a good reason to tell, not to ask after such stuff.
Saying why it is not possible for DC to make it, especially if incest is involved is at least constructive.
It would be funny if suddenly all moms are Landladies. All sons and sisters just roommates. Even if it is clear what they are, same as Debbie, Jenney, Diane and Tammy. It would be as if it is a parody on Patreon's rules.
Fun little story I thought I would share, I just started playing the updated version of this recently and was so confused when the Russian mob boss had the same name as the MC and was like "is this some story twist? and why is no one mentioning that the mob boss has my name?" only to realize that it was just a huge coincidence that Raz is the name I use in all of these games and the mob boss just happens to be named Raznikov...
Most characters I use get the name Jane. Mostly because it could be used on both genders. So I needed to read more carefully if the librarian get involved.