I checked my Tracy lineage in Canada and could find no Terrance or Terrence Tracy, and wikitree says no blood relationship can be found. One thing I would note-- we Tracys seem to be prone to changing the spelling of our last name to Tracey. As I go back four or five generations of my ancestors, there are several people who changed their last name to Tracey, for reasons unknown. If you haven't as yet, it might be worth checking alternate spellings of Terrence's surname. If he wanted not to be found he could have created some evasive versions of his name!