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Since the Realtor will have access to all properties on the Muliple Listing Service, you would be able to see home interior and exterior pictures, virtual tours and more detailed information about each home in one convenient location (at the agent's office for example). Another benefit is that the agent can indicate a search for only one level homes, thereby not wasting time by searching for homes that may not appeal to all the buyer's concerns.
Find a professional Realtor that you and your parents are comfortable with to help you through the process.