Some cockerels crow awfully early. It's not unseen that they start at 5 weeks. You can post a private YouTube video with anyone with the link being Able to see the video and put the link here. Some photos of the bird might be helpful.
I agree with @JedJackson but 3 still has hope.1 and 2 Is definitely a Cockerel but maybe wait another 4 ish weeks before you make any decisions about 3.
Brown one is a red sex link, also known as Golden comet, cinnamon queen, Isa Brown, Golden buff, and like 80 other names. She'll be a great layer. I will need a more clear photo of the white one only. Maybe a white rock or leghorn
1 is a pullet.
2 looks like a red sex link and if she's not, still looks like a pullet to me.
3: That looks like a rose comb and they are much harder to sex. I'd say Cockerel for now but it's worth waiting 3 ish weeks to know for sure.
4. Pullet
I agree with @Cloverr39 that silkies cannot be wing sexed. All 3 of my SR silkies had the uneven wing feathers so I thought they were all Hens, but I had 2 roos and 1 hen. Silkies are also extremely hard to sex until they are mature. Some cockerels take 8 weeks to show signs, some take 16...
Thank you! I got him from a guy who was rehoming him and he wasn't sure if he's a pure Ameraucana or not, but since he looks like one I figured I'll probably give him a shot for the blue egg genes. He IS gorgeous and is great to the hens. I haven't hatched eggs yet because all my chckens started...