The best source on the Gammon and Sarah Hayward family is the book Gammon Hayward: 1828-1883 by Ida Hayward Wagstaff, published in 2006. My mother sent me a copy. It is a well-documented book which tells about the Haywards and their roots in England, their conversion to the Church of Jesus Christ of Latter-day Saints, their move to America, and the history of the family in America. An interesting chapter in the book tells of a trip to see the Hayward family home in Deal, Kent, England.
Other sources about the Hayward family include accounts by various people about their voyage in the ship the International and their trip across the plains in the Jacob Gates Company. I also have some short anonymous biographies provided to me by my grandparents. I will post these in turn, but for some reason, processing the information on the Hayward family is proving to be a challenge. The posts for the next while might be a bit sporadic and brief!
The photo of the Deal seafront is from wikipedia.