[US] Received $20,000 for a van

A family member is selling a van. They facetimed with a potential buyer to show them the van. This person sent them $20,000 now saying to use 5k of it for the necessary repairs so that when they fly to pick it up it’s completely ready for road tripping. They say they will pay the other $20k+ when they arrive to pick up the van. They sent the 20k through PayPal and it is now in my family members bank account. They say it’s legit but I’m not so sure. Other than asking for it to be sent back (family member won’t do that) is there any other potential scam here?