Try these in the searches and/or give to your Realtor. Sometimes the less data you put into the field, the better chance you'll have to find something that will work. Good luck.
Brock Realty Inc.
If you'd like to search the MLS like an agent in real time, you can visit our website and sign up for a free Listing Book account. You will be able to change the search criteria to suit yourself and received morning reports regarding new listings, price changes and recent pendings.
Unfortunately there really is not a search function on Trulia for a in-law quarters. I would suggest contact a local Realtor to assist you in finding a home with one. Realtors have much better access to information and will make find a home with a in-law quarters much easier.
Please feel free to call or email with any questions you may have. Good luck!
Sales Associate / Property Manager