William and Margaret Davidson migrated with 7 children, arriving Brisbane on the Genghis Khan on 18th August, 1854  
Three Porter brothers married three Davidson sisters. Some of their details, and their children, are listed in the following doc: Porter-Davidson marriages (PDF)  
 
 
 
   
DAVIDSON William 38 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON Margaret 38 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON Catherine 16 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON Charles 14 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON James 12 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON Jane 10 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON Margaret 7 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON Anne 5 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696
DAVIDSON William 2 Genghis Khan 18 Aug 1854 IMM/112 62 Z1957 M1696		  
   
Below: William and Margaret's marriage record