If Lorenza (or Losenza) Backus married a James Richmond (per Megow genealogical records by Nettie Adell Woodworth) it makes sense that Lorenza, sister of my Laura Backus married James, brother of Laura's husband Thomas Richmond. So that's the theory I'm going with unless and until I find one better.
James Richmond's will (probated aft. 15 December 1874) named Ira Pratt Richmond as his son. The Megow records stated that Jim and Losenza (Backus) Richmond had two sons, Ira Pratt Richmond, who supposedly died in the Civil War and Asberry Richmond who died at the age of 3 or 4. If my theory is correct and Thomas Richmond's brother James was married to Losenza then Ira Pratt Richmond was still living when James' will was made.
Was Ira hiding in plain sight in the 1850 NY census? Ira Richmond, age 13, was enumerated with Elijah & Elizabeth Richmond, who were James' parents. However Ira was listed next to Silas in the census and James was not with the family group, so the assumption on my part several years ago was that Silas was Ira's father. Now it seems more likely that Ira was James' son.
Where was James Richmond in 1850? As I mentioned in this post, there was a James Richmond in Auburn Prison (NY) in 1850. Was it this James?
In the 1860 WI Census taken in Walworth County, James A. Richmond was enumerated with his brother, Ira and Ira's wife Lucy.
1875 WI State Census, Walworth Co.
Head of Family Male/Female
Richmond, Pratt 3/2 [James' son?]
Richmond, Ira P. 4/2 [James' brother?]
I.P. Richmond in the 1885 WI State Census Genova Junction
5 males / 6 females
[Probably the Ira Pratt Richmond who was James' brother]
The 1900 MI Census lists a Pratt Richmond, b. ca 1833, in New York, as a patient in the Northern Michigan Asylum in Grand Traverse Co., Michigan. He died on December 19, 1901. Was this person the son of James & Lorenza? The death record certificate does not record any parents' names. Perhaps more can be discovered at the Archives of Michigan.