http://cs.bloodhorse.com/blogs/truenicks/archive/2008/08/24/reader-q-amp-a-why-do-nick-ratings-vary-by-a-sire-s-different-sons.aspxQuestion : We were wondering why Rahy crossed on Trempolino is a C TrueNicks but Runaway Groom (through Cherokee Run) crossed on Trempolino is an A when they are both Blushing Groom sire lines. Mare is Emeralino. Your thoughts please.... Regards, BrianenCommunityServer 2007.1 (Build: 20917.1142)