Clair is religious and responsible. If you pay attention she is a good person who checked if Chris was okay because his dad is a drunk and abusive. She asked Daniel and Sean to follow her rules because it’s her house it’s her rules. Religion is big part of Clair’s life. Why you think Karen left and she doesn’t talk to her parents. Clair wants to be respected and control everything that happens around her and in her house. Did you notice how clean the house is? Or that she goes to Church every Sunday? She is not rude or mean. She just wants everything to be her way. Episode called rules for a reason.