Well if he really hate his wife's family that much, just kill them all and enjoy life with his wife. Sounds better than avoiding the wife who do nothing wrong, just come from the bad family.
Wow! I never see the protagonist who so full of herself to put some dangerous man in his place. They're always innocent girl who can attract male leads to help her in most bad incidents. Could it be this is some feeling that those female lead had deep down in them?
Oh it's really the life of typical female protagonist when writer let every men love her and help always arrive when she's in trouble. Charlotte seems to know it well and just went outside without the care of dangerous at all which sounds reckless and too naive for a girl.