@omegaxis1
I doubt that the mother wants to escape, it's much more likely that she has a severe case of Stockholm syndrome herself. Remember, she kept reminding her children that they must be good members of the family, she didn't do anything to protect them.
And FL is saving the guy because she knows he's the brother of the heroine, and she needs him for her own escape/protection, it was explained in earlier chapters.
I doubt that FL is interested in him physically or romantically, she only faked it because she knew her father wouldn't give her the "toy" if she didn't act that way.
I can see the ML developing an obsession though, definitely has obsessive written all over him.
FL is such a survivor. She has adapted and she will overcome! 😍
I wonder what her game plan is though, so far she seems to be plotting to subvert the family and disappear to live in peace 🤔