I am a decendant of Issah Benjamin that came to Australia in 1853 on the "Marquis of Bute" with his 2 children - he had another 5 in australia. Sarah Benjamin (born 1852 in london) then married Joseph Davis in Australia (convict) and their youngest child is my grandfather.

How do I track down Issiah's parents and Elizabeth Harris - his wife - believe they were married in London but not sure if Issiah had siblings?