There is nothing wrong with giving them a little more of your time, and there is nothing wrong with your parents understanding that. As long as the young man in question is an independent person and not tied to his parents by the hips there should be no problem. The point is that as a couple you should be independent and not be tied to either set of parents. But yes you should be sensitive to the fact that they should be included and not left out. You might be very surprised. She might be a very independent woman herself since she was NOT stuck in the home as much and might NOT need so much attention. You might find her to be a very fun and active person and someone that you might enjoy having as a friend, a fellow shopper, someone to go to lunch with, etc.
You might also be surprised that they might enjoy traveling and might not be at home that much at all.