Locks and checking mileage and so on? No. Simple, honest, aside, man-to-man talk to Step-ie. Like, "Bottled water when the water from the tap is free? If you got that kinda money, why are you here? Grow up, straighten up and fly right or fly the fuck outta here. And, whatever ya do, don't upset your mother in any way or I'll kick your ass. Maybe not physically, but I will... kick your ass. This bus is gonna stop sooner or later and you'll have to get off so get off yer ass while the gettin's good." If he don't understand that, he ain't never gonna leave anyway.

Of course, as John said, it's easy for all of us to pontificate from a distance. I just hope, as has been said, things work out without ANY conflict.