This might be a minor issue, but you might want to adjust Miss Mitchell's age and/or how long it has been since she last saw the MC. With the default age of the twins being 18, it would mean they were six while you and wife (then girlfriend) last saw her, babysat her. Ex) Twins are 18, Miss Mitchell said she was 24 and you hadn't seen her in 12 years.
It is not game breaking, just a little odd you were babysitting a 12yr old with your wife/girlfriend while you had 4 kids at home.
Edit: Miss Mitchell being Rose (for those who might not get what I mean.)