i'm not really bothered if the ending is "happy" if your choices lead to a family member of choice getting killed or sacrificing themselves i'm not bothered so long as the ending is satisfying.
As for Alice she's had relatively little plot time recently, pretty much all she's done is sex scenes, we also don't have very much info about what she was doing when she was staying with the Aunt. In fact i'd say that since the Mom is the main object of the players affection most of the time that she can be trusted, especially since she is often the receiving or submissive partner in the scene either with the MC or other characters, Tracy has laid her cards on the table at this point and i doubt there is a significant revelation about her coming. that leaves Alice, Aby and the Aunt, i would suggest that these three are linked in some way beyond what the MC knows, we also haven't seen Aby and Aunt Jenna in the same room.
this leads me to make a couple of observations, it's long so spoilers here we come
Phew that took longer than expected, i'd love to hear what you think of who/what the Apparition is going to turn out to be and what if anything will happen with the MC's Dad.