Then he claimed kinship with one of the wealthiest men in Britain.
You know, if you look at his words strictly, he did not. What he said was "Gerald Cavendish is my second uncle." Others have pointed out that "second uncle" is not a relationship that any geneology expert would admit even exists, so what he meant by that is anyone's guess. I will here point out that I don't know of any "Gerald Cavendish." Canvendish is the family name of the dukes of Devonshire; rich, to be sure, but not billionaires. "Gerald Cavendish Grosvenor" is the current (6th) duke of Westminster. That is no doubt whom Syleman meant, but it's telling that he got such a "close relative's" name wrong.