Hi Mary,
Thanks for your post. It looks like this Frederick Behrens was the one that arrived at Moreton Bay in 1855 with his wife Louise - so probably not the one that married my Catherine Driscoll. Also, this now eliminates the 1900 Qld death record for Fredrich Julius Franz Behrens where the mothers name is recorded as Catherine. It can't refer to my Catherine as this man was 72 years old at the time he died.