I don’t think he was KGB. He was sent to Russia as part of a program to fake defectors. The Russians did not find him credible, and he wound up living in Minsk with a woman, working a dead end job. When it was obvious the Russians didn’t take the bait, the US government paid for him to return home where he faced no consequences.
Probably just a coincidence.
I believe his wife’s uncle was a colonel in army intelligence. In 1962 it would have been difficult for her to leave the USSR unless it was sanctioned.