I also recommend still receiving the MLS listings of those that have first floor bedrooms, you never know when one of the bedrooms may be large enough to make you and your father in law happy.
Another option that you may want to consider is looking for homes with two master bedrooms. I can set this search up for you. actually can thinkk of a really great one that is here in Fuquay Varina and is new construction.
Let me know if you are interested in having me help you with any or all of the above recomendations I would be glad to help!
Have a great day!