What gender are my chickens

[ZaraTiara]

I have 2 chickens that I believe are 11 weeks old but as they have grown, they seem much bigger than they should be for 11 weeks. I'm unsure of the genders of both. They are both very friendly but in the last few days, the black chicken (pretty confident is a cockeral

has started chasing and trying to bite (and has been successful in doing so twice in 2 days) my brother and his girlfriend as of today when they try to enter or exit the backdoor of our house. No one else is experiencing this issue except them. Not even visitors who are meeting them for the first time. Are there any explanations for this?

 

[Brahma Chicken5000]

Both are cockerels.

 

[Brahmachicken240]

Two lovely cockerels

 

[DobieLover]

So sorry but the first two posters are correct. You have a couple of cockerels.
As for why the darker one is targeting your brother and his girlfriend, maybe he sees them as a threat. You'd have to watch how they interact with and behave around the bird to determine what triggers him.

 

[sourland]

Both are cockerels, and the behavior of the aggressive bird will escalate unless he is given an attitude adjustment.

 

[drumstick diva]

totally agree with Sourland.

 

[Frazzemrat1]

Agree on all counts. You have two boys, and they will only get worse if not corrected. Even eliminating the dark red one, by removal or otherwise, may not fix the problem. If he's more dominate than the white, the white may start taking on the aggressive role once he's gone. FYI. Check out this article if you're planning to keep either or both:
https://www.backyardchickens.com/articles/beekisseds-rooster-speak.73664/

 

[Alexandra33]

Handsome cockerels.

~Alex