ANSWER:
If this was made clear to her and she had agreed, you are not sinful in Sha Allah.
If this agreement was not stipulated in the marriage contract then you should provide her separate accommodation near your parents house so that you can go to your parents everyday and serve them. Keep a 24/7 maid to take care of them or give your wife a separate quarter in the same house, with a separate washroom, her own room and her own kitchen where no one enters without her permission. This is her right.