Hard to tell genders in the pics, but it looks like 1 hen and 2 drakes. The brown one looks like a hen. but in person you should be able to tell. Males will start to get noticably larger than the females!
You have a chocolate barred (male, white with the funny feathers), a chocolate (female, brown) and a black (male, the funny feathers on the chest will molt out when he molts into his adult feathers)