I will admit this is pretty out there. But could the reason that George B. cannot be found officially- be because he was born Anna B? Could he have been born a female, yet later begun living as a male? Could George B. have been a transexual? It was the 70's, a time of sexual freedom, gays were starting to come out of the closet, yet there were still a lot of negative attitudes. And transexuals were still not openly talked about in most circles.
One thing that has always bugged me, was the fact that the two George's cohabitated in a small rented room, not an apartment and not two separate rooms. Something they would not have had to do, as George W.'s income alone would have been sufficient to rent two of those rooms. There could have been a homosexual relationship between the two, but that hasn't become apparent as they were both flirting with waitresses.
Yet if the two of them knew the other was the opposite sex, that may have allowed them to bypass to themselves the whole two guys living together attitude.
As a doctor George W. could have become privy to George B.'s secret, been intrigued, then become interested in "George" as a person. That may have led to the whole protective attitude, and to the fact that he needed to support "him" both emotionally and financially.