for those who are not familiar...A.F.S. is American Field Service an 'exchange" student program...i hosted a student from Sweden in 1970 and we have kept in touch....it is a great program...
http://www.afs.org/afs_or/home

when i saw you said you were looking for a host brother i thought
you meant "lost" but now i see "host" is probably what you mean.

maybe a lost host/??