http://www.bbc.com/news/uk-scotland-highlands-islands-43554248
No obvious reason 'laid back, doting uncle' vanished
Eamonn said there had been no incident, such as a "run-in" with another group before Liam became separated from the stag party, that would explain his disappearance.
He said: "Liam is very laid back, very positive, a very proud and doting uncle to my two children.
"He's never been restricted in what he's wanted to do in his life. There is no reason that he would take off and not let us know."
He said: "It's incredible the help we've had from strangers. If they can be hopeful, then I can be that way as well.
"We've been told the efforts by ourselves and others in trying to find Liam in Hamburg is unprecedented. That makes me feel confident that we are doing everything we can to find him."
rbbm.Eamonn said that while his brother's survival instincts continued to function, such as being able to find food and drink, he may not know who he is, or where he is due to the effects of amnesia.
The missing persons charity, the Lucie Blackman Trust, has told the family that it was "easy" for people to lose themselves in continental Europe.
Eamonn said: "The trust says it is a lot easier than getting lost here, and that people with a head injury have ended up in different countries than the one they went missing in.