Yes, Valentin is Maksim's brother. Carrie and I watched America's Ballroom Challenge (TiVo'd from PBS -- I'm curious if TiVo would have picked it up as a suggestion, but it turns out that my mother informed me of it and I added it by hand), at which Valentin and his partner, Valeriya, performed. They are already British Open International Under 21 Latin Champions.

By the way, I'm delighted that you snapped up that quote from GSBB-L. It was excellent.