Tradtionally, BI-Level style homes , have been considered "mother/daughter" homes. But if you limit your search to Bi-Levels, you may miss a home where the owner has added on to a different style home for a related family member.
In fact, I listed an sold a house a few years ago where this happened.
If you would like some assistance with your search, please contact me on my cell.
Teri Malone, Keller Williams