Seller refuses to work with anyone who has a real estate agent

[Kristina Clifton]

My mom and stepdad are trying to buy a home closer to my location. I found one listed that is about 5 minutes from me that is a FSBO property. Her real estate agent called to see about us looking at the home and the homeowners said they would not work with anyone using a realtor. She stated she'd be willing to cover any fees regarding her realtor but seller still refuses. Any guess as to why?