Canhams in New Zealand

I have researched the Canham side of my family and located a Henry Canham, born c1766 married Elizabeth SALTER at St Margarets, Ipswich, Suffolk, England (second marriage). A son was Harry Canham, baptised 22 Sept 1834 at Ipswich, married 25 Jan 1855 to Joanna SMY. They emigrated to New Zealand in June 1861 with their six children, one dying on board during the journey. They produced another ten children in New Zealand (must have been the climate down here!!) Their daughter Rose is my grandmother.
The family tree is fairly complete from Rose onwards, but I would like to obtain more information about Henry's and Harry's families.
Can anyone fill in the blanks?