Are you developing families outside of your legacy? I like to build out the world around my sims, so they can have friends with their own lives and stories. Getting involved with those can help.
Since you're playing occults, you could always make a family or a group that hates them? Like a vampire hunter clan, or a family of wizards who can war with your family for generations?
If the kids have any hobbies, you could also start a club for them? I made an occult boarding school, and use the club system to have a Gardening Club, a Seance Club, Music Club, Volunteer Club, and Swim Team. The volunteers visit the retirement home every week or raise money for the school, while the swim team meets every Friday to swim at a local pool.