Several readers have solved the problem of the Sweet Sixteen gatecrashers’ ethnicity. They are Haitian Freemasons.

Derb — You wondered about the ethnicity of the Sweet Sixteen gatecrashers. I can’t speak for all of them, but Neville Laibhen (along with, one presumes, his relative Einstein Laibhen) appears to be of Haitian origin. A little Googling finds that a Neville Laibhen of Brooklyn is listed as being affiliated with the Grande Loge Haïtienne de St. Jean des Orients d’Outre Mer, which is a Haitian Masonic institution.

Haitian Freemasons — why didn’t I think of that? I knew they couldn’t be Bhutanese Pentecostalists, Siberian Wahhabis, or Zimbabwean Taoists …

And still the jokes come in:

Mr. Derbyshire: I think the Laibhen family has a sibling named Heisenberg, but I’m uncertain.

[Me] Boy, this Einstein guy sure has a lot of relatives!