Just watched the Angel episode "She" which made me think about Tara's demon family theme in Buffy.
On Buffy, Tara's family believed that women in their family became demons when they turned 20 or so, and thus should be kept at home. In "She" there's a dimension where the women have ridges on their back that glows red when they're aroused. So to control the women, the men yank out the ridges in the women's back and then the women are passive slaves.
Now I'm watching the episode after that which is "I've got you under my skin" where a family of 4 seems really afraid of the father. The story goes that someone in the family is possessed by a demon and that's why they're afraid of him. Wesley says that a father doesn't need to be possessed by a demon for people to be afraid of him. This episode gives some back story about Wesley and more for Wesley to do. I'm liking him more.
Interestingly, it's the son that's possessed and the father is now much friendlier. Turns out the boy is a bad seed and the demon was trapped inside the boy. Nice twist.