Hello Grant, I have a Ephraim Pratt born 1834, son of Isaac Pratt & Margaret Kennedy. Isaac was a younger brother to Abraham Pratt. My records show's Ephraim married Margret Kidd at St Johns Church, Richmond , Ontario 7th October 1869.From this union I have one daughter Emma Jane Victoria Pratt although I have my doubts because Emma was born
eight years prior to the wedding so maybe Ephraim had a earlier wife that I am not aware of. The other people you mention I have no record of. I have not followed Isaac's family too closely but the name Ephraim pops up quite a lot and I think if you do some work on Isaac's tribe you should find your answer. Yours Mike Spooner.