The Gameboy and Gameboy Color thing has always gotten me thinking as well. For instance, the original Gameboy did NOT sell over 100 million units but for some reason, it's officially listed as such because everyone lumps the Pocket and Color Gameboy into the same line. It doesn't make any sense.
Next you will tell me DSi shouldnt count as the DS family of systems and New 3DS isnt apart of the 3DS family
GameBoy Color is just another member of the GameBoy family and sales should be counted as such.