Hi -- I am a descendant of Theresa M. Jacox. Thank you so much for this information, because this is the first lead I have found regarding her ancestry. In return, I offer the following in case someone who comes along needs it.
Therea M Jacox married Lawrence Bendwell (name variations Lawrence Charles Bendwell, Charles Lawrence Bendwell, and Lawrence Bendwill) in Watertown, NY on February 14, 1894. They had, to my my knowledge, the following children: Viola John l Elwin C Gladys Leo Luella
Theresa was referred to by her family as Thressie and that is the name I found on her death certificate.
To my knowledge, everyone listed in this post is no longer alive. I have omitted the name of living descendants to protect their privacy, but would be happy to share with other amateur genealogists if they contact me privately. Good luck with your search.