It would tend to mean that his iPad is out of reach.
He has either turned Off the Messages app.
Or Turned the iPad off Completely.
Put in Airport mode.
Moved out of range of his WiFi.
The router has suffered a Power cut. (no WiFi)
Something along those lines.
He has removed the Apple ID he was using and is now using another.
The iPad has run out of Power and is therefore "Off"
His mother saw the fingerprint marks on the screen and put it through the Dishwasher to remove them ( This is a joke line and should not be tried)
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously