I might have written it wrong in the walkthrough actually.Thank goodness you posted it, otherwise I wouldn't have known you have a major bug. The war path activates no matter what choices you make. There currently no way to get the version where the mother and daughter are on good terms. Even if you ignore them both completely.
If you completely ignore Penelope, don't peek on her in the shower, don't tell her she's got a nice arse, and be nice to your wife (kiss her, compliment her etc), it doesn't trigger.