Guess what, I have yet another idea: a family-based horror RTD!
Family Fun: The RTD
The point of the game is this: all the players together form a standard nuclear family, and they get two choices in this: the first choice is what family member they are, the second is a special trait!
You could be:
The Dad: the man of the house. The keeper of the family. Brings home the bacon, is most suited to defend his home from invaders. +1 to physical combat, possesses a weapon or tool to be defined by the player. However, the Dad is always the first one to be targeted by evil!
The Mom: the lady of the house, the person who runs the family, essentially. Will do anything to protect her children. +1 to any action involving directly protecting her kids! The Mom does, however, have to roll against panic if she is ever in a situation where she doesn't know where her children are!
The Teenager: the eldest child, has the fresh outlook on life and open mind needed to calmly evaluate and potentially exploit the situation, but is mentally vulnerable as a result! +1 to learning and using eldritch techniques, -1 to mental resistance rolls!
The Little Kid: the youngest child and the most vulnerable of the family! +1 to running and hiding, evil has to roll against innocence to directly attack, but has a -1 to defense and attack if evil does indeed enter combat!
The Family Dog: the animals, they know! They know things and they can see and smell the evil! +1 to perception and agility, but cannot speak (other than barking on command, that is).
You can choose a trait (say, an occupation, hobby, status in school or something that grants both a bonus and a penalty) in addition to these bonuses for family members, allowing for some further customization (and counteracting certain penalties they have).
The idea here is, the family has gone on a trip to a nice, secluded vacation spot. Unbeknownst to them, evil lurks in the innocent little house! Surreal horror, monster-based horror and all kinds of other horror ensue as the family is drawn into a horrible supernatural intrigue surrounding their house! It's like Call of Cthulhu, except with family instead of random investigator schmucks.
I think the family bit might provide an interesting RP opportunity, plus it will allow the GM to chuck every horror trope they know at the players and let them deal with it in a wholesome, family-oriented way!