Actually, they are part of the tanager-cardinal lineage. The AOU moved this genus into the Cardinalidae family in 2008. They may actually belong in one genus with the aberrant blue "grosbeaks" of the genus Cyanocompsa. If that is correct, the Dickcissel in the genus Spiza would, quite amusingly, indeed turn out to be one of their closest living relatives.
Amaurospiza contains the following species:
- Rothschild's Grosbeak, Cyanoloxia rothschildii
- Blue-black Grosbeak, Cyanoloxia cyanoides
- Ultramarine Grosbeak, Cyanoloxia brissonii
- Glaucous-blue Grosbeak, Cyanoloxia glaucocaerulea
List is from: 
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