Today I came home and stayed at home alone for a while. My Grandma was taking my Mom to the doctor because of her back. When they got home they had a strange story. They said that they lost approximately 20 minutes of their memory, both at the same time. They can't remember anything after a similar place they drove by (they both lost memory at about same time), and they both looked around and said "what happened" and "where are we" at the EXACT SAME TIME. About 29 minutes had passed and in that time frame they couldn't remember anything at all. They passes notable stop lights and a school but don't remember it. My only theories are they were abducted by aliens or used to test a memory eraser tool created by aliens. What should I do?