Hi Sue are you still looking for information about the Pickett family line? Maybe not after 5 years
I am on a similar path with an interest in a daughter born to William Pickets 3rd marriage Alice Maude Pickett b1874 her mother was Eliza Hamm, Eliza had a previous marriage to a John Cooper, Eliza Cooper and William Pickett married abt 1872.
Re your comment about the UK Census did you look under Pickell? there is a family under this name in the 1871 Census civil parish of Witney; William Pickell 39 Head, Louisa 24 Wife, William son 9, Louisa dau 7, Clara Ann dau 4, Elizabeth dau 3.
I mention above I believe William had 3 marriages
1 Phoebe Douglas b abt 1838 married 1860 record on FreeBDM, William and Phoebe had 2 children WIlliam & Louisa. Phoebe died in June Q 1865.
2. Louisa Douglas (not confirmed) I was unable to locate a marriage between William and Louisa Douglas I do believe that Louisa was the younger sister of Phoebe Douglas and was born about 1847 this is only speculation on my part! Louisa and William had 2 children Clara Ann and Elizabeth
If the Census record in 1871 is in fact this family then the timeline certainly fits it is apparent that some tragedy struck the family in 1872 with the deaths of Louisa, Clara Ann and Elizabeth I am looking for this information!
3. Elizabeth Cooper nee Hamm married 1872 record on freeBDM, William and Eliza had one child Alice Maud born 1874 in the UK the family them emigrated to NZ in Dec 1874 from Portsmouth on the Baron Aberdare arriving Auck NZ March 1875. The passenger mainfest I have viewed showed the Prickett family (another spelling varient) William 43, Eliza 30, Louisa 11, Alice Maude 4; there was no sign of the son William who would have been aged 13 from other research I know he came to NZ as well. There were 7 children born in NZ to Eliza and William.
If you have moved forward and found your information and wish to collaborate please respond as I still have many unanswered queries!