can anyone explain the link

2 companies THX and ROY have Phillip Crabb as director
What is the link to ATN, Rick Crabb..brothers, same name.?

ATN
Mr Rick Wayne Crabb Chairman 01/09/1999
Mr Thomas Peter Dukovcic Managing Director 22/04/1999
Mr Rodney John Dunn Director (other),Company Secretary 22/04/1999
Mr Peter J.L Bradford Non-Executive Director --


ROY
Mr Malcolm Roger Joseph Randall Non-Executive Director (other) 04/10/2006
Mr Philip George Crabb Chairman 28/11/2005
Mr Frank DeMarte Company Secretary,Director (other) 23/02/2004
Mr Brian Dudley Richardson Non-Executive Director (other) 23/02/2004
Mr Marcus Flis Chief Executive Officer,Managing Director 01/04/2008

THX
Mr Brett Thomas Lambert Managing Director 01/05/2007
Mr Malcolm Roger Joseph Randall Non-Executive Director --
Mr Philip George Crabb Chairman --
Mr Frank DeMarte Chief Finance Officer,Company Secretary,Executive Director --
Mr Brian Dudley Richardson Executive Director --

can anyone shed some light on this..