The general belief was that Florence Fordham was the daughter of Rev. Robert Fordham, who with John Carman went to Long Island and signed the Indian treaty for the roughly 200,000 acres that comprise modern day Nassau County, Long Island.  I am not sure where that all started from for sure, but more likely she is the sister of Robert Fordham and John Carman and Robert Fordham were brothers-in-law.

Tredwell Fleet Carman, in his letter of 1880 to Ezra Ayres Carman states that John and Robert were brother's-in-law in a rather matter-of-fact- way.