He was supposedly born about 1827/8.
His second wife listed on the webpage is MaryAnne Elizabeth "Malissa" Moore provided his sources are correct.
the letter is not one of those I have but is one RTM Simmons's grandson has or has had access too at some point in time since he has them transcribed on his website http://psysim.tripod.com/rtmsimcsa2.html It is the letter listed as number 12 or just use the "find" feature under [edit] and put in "Uncle Thomas" and it comes right up.
Rhonda