I had two other clues besides Grandma Ruby's chart: a luggage tag (which would prove to be vitally important) and my great-grandmother Ruth Prosser Chase's obituary.
After finding my cousin Marvin Prosser just a few years ago (he is the grandson of Charles Douglas Prosser, my great-grandmother's brother), his Y-37 DNA test with FamilyTreeDNA proved that we were indeed Prossers. And a couple of years later, his autosomal test with Ancestry proved that my 2nd great grandmother was Rhoda Wiltse, daughter of Reuben Wiltse and Mary Ann Brown.
Just a little over two weeks ago, I took another look at Marvin's Ancestry DNA matches. Just for kicks (because I'd done this many times before), I typed in "Prosser" in the search box, to get a list of his matches that had that name on their family tree. And to my surprise, there were several more than the last time I'd looked. Marvin's second closest match was a third cousin, who shared 124cm across 7 DNA segments; the next closest match turned out to be her son, who shared 61cm across 5 DNA segments. They both descended from Louis Prosser, who married Susan Ragan in LaPorte County, Indiana in 1846. Louis and Susan Prosser are listed on the 1850 and 1860 census of Cool Spring, LaPorte County, Indiana. I dismissed him as a possibility - my great grandmother Ruth Prosser was born in Hillsdale, Michigan in 1860 - but other matches, also descendants of Louis, made him impossible to ignore.
What if? What if he had left his wife and children, traveled to Hillsdale, married (or not) Rhoda Wiltse, had another 2 children (Ruth and Charles), and then joined the service to fight in the Civil War.
And then I remembered something.
Quite awhile ago, I checked the USGenWeb page for Hillsdale County, Michigan, which had a complete listing of all that county's volunteers. There was a Lewis Prosser listed in Co. G, 2nd Michigan Cavalry, but he was 17 at the time of his enlistment..
I found him.
There is lots more research for me to dig into - while I'm at the Family History Library in Salt Lake City later this month I'm going to look at all the records they have for LaPorte County. And since most of the county newspapers are still on microfilm, I may be stopping at the Michigan City Library on my way to Grand Rapids for the National Genealogical Society Conference in May.
But, oh, joy of joys - I found him.
Which proves what I've been saying for years:
There is ALWAYS something more to find!