Yeah. Probably at least two perps would be my guess.
It might have been possible depending how they were sleeping. If they got the guy first and he was sleeping alone. If they were split up in different rooms with no more than 2 to a room, maybe. It would still be very difficult for this to not wake up others around the house with just 1 person, everything would have to go just so in their favor.
Weird crime…killer had to get to house and leave somehow…covered in blood and probable cuts on his arms and hands as well…must live alone to be able to clean up, dispose of clothing, knife…did killer use a vehicle or was on foot?…vehicle would have to be cleaned too…RIP young people, prayers sent for all the family and friends…