Don't do anything rash yet. I think only Rose is a cockerel. Do you have any baby pics of them? RIR pullets have darker chipmunk stripes than cockerels. Look back and compare.
only Rose looks like she might be a roo. My RIR hens had huge combs almost from the start. I kept thinking they were roos and then they all started laying.
Sorry to jump into your thread with concerns of my own, but after reading these posts and reviewing the pics (especially those of Violet), now I'm wondering about my RIRs. I purchased them as pullets, and thought they were, but what does everyone think? My birds are about 7.5 weeks old. I'm going to be really bummed if these turn out to be roosters. The guy I purchased them from also sold me two Welsummer pullets that turned out to be Brown Leghorn roosters!
These two RIRs are the same age as my Leghorn roosters, but aren't as big so maybe that's good?