Is there going to be more to this story or is it just going to be the father and the brother? [i.e. other members of the family (uncle and cousin) with side stories such as the fast food restaurant manager and the local street corner thug and maybe the lecherous construction worker over on the next block.] Also, as mentioned earlier by another commenter, keeping sleep up is a tricky thing to do with it being a 1:1 ratio of sleep:energy. After a couple of days, you literally have to spend 16 hours sleeping just to catch back up so you can do things without "dying" (and that's with sleeping at 23:00 every night). It gets harder when you try to "help" your brother at work. Otherwise, I'm really enjoying it and I'm looking forward to where it goes. :)
I have several ideas in the planning phase and one of the most popular is the throuple option for the existing characters. More characters in the future is definitely a must.
RE: Sleeping
Well, my vision is to create a sense of ramification for all of your actions. It is a bit annoying but I think it plays fairly well into the "growing suspicion" mechanic where the characters gain suspicion daily once you pass some certain lust thresholds with them.
Also, the activities you are doing in this game is very taboo and having some consequences can make it a bit more "thrilling" as well as some sort of wake-up call.
Finally, count your luck that I didn't put a cooldown between your sleeps. ;)