Aside from all the super-groomed nimble running around, why were the fog lights on on the Volvo? I found myself alternating between getting cross at minor details like this and thinking Ellen's crazy, no Paula's crazy, no it's Ellen. So maybe yes they both are a bit unhinged.
Caris doesn't appear to live with them. She either doesn't exist or is elsewhere. Maybe Paula's husband isn't her father and she lives with her bio dad? I do find myself thinking of The Hand That Rocks the Cradle. Anyone remember that film?