If they have red earlobes, I'd say Hollands. If white, I'd say California Grays. The roosters look like CGs, but could be BHs. I'm not an expert on either breed, though. Seems they are both rather rare. Looks like yours have red earlobes, right? Had to research on the earlobe color of CGs before I could decide.
Welp has CGs. Here's their pic...white earlobes.
http://www.welphatchery.com/std_breeds/production_black.asp
Welp has CGs. Here's their pic...white earlobes.
http://www.welphatchery.com/std_breeds/production_black.asp