Tim Ricker's DNA has been tested for genealogical purposes. It may be possible to confirm family relationships by comparing test results with Tim or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
I've been curious to learn more about my family of origin for a long time. As more of the older members of my extended family pass on, the opportunity to do so seems less likely. The discovery of Wikitree, along with the progress a cousin's daughter has made on this site, makes it appear that there is some hope after all.