Duck gender/breed identification needed!

[Duckstruck]

A close friend of ours came to us in need of rehoming a trio of 7-week ducks from Easter because his grandson is "tired of them". We have a barn, and I've been raising ducks for 3 years. They're Unsexed and are an unknown breed. Here they are...

I've had male and female ducks before. They sound like females to me, and my suspicions is that the white one is Pekin and the other two are Cayuga. Again, my suspicions.
I currently have two buff females and one pekin female. I don't have any boys, and I intend it to stay that way (a drake killed one of my girls.) That said, I know a place to rehome drakes, since I sent mine there and he's doing fine.
Could someone please help me identify those ducks? I would like to know what precautions and quarantine I should do. Thanks!

 

[TheTwoRoos]

The ones still peeping very squeaky are probabaly ankes the one quacking is a girl.

 

[2 many chickens]

I don't know because I couldn't hear them only the kid screaming WOAH. If they peeping they boys, if they quacking they girls. If it puts on some high heels and a skirt it's possibly female too.

 

[house.of.ducks]

To me they sound female, although you can’t be too sure at that age. It’s best to wait until they get older. The females will quack and the males will make a raspy almost bull frogish sound lol. As for breeds I see 2 Cayugas (the black ones) and a pekin

 

[chickens really]

The Blacks are younger than the Pekin and I never heard a Quack..All I heard were Peeps and normal Duck sounds.
Pick up the Pekin and walk away from its friends. Hens will Quack loudly..

 

[Duckstruck]

The Blacks are younger than the Pekin and I never heard a Quack..All I heard were Peeps and normal Duck sounds.
Pick up the Pekin and walk away from its friends. Hens will Quack loudly..

I haven't seen the birds in person. The photo and video is from our friend. He's bringing them by our barn for me to look at next week. I'll be able to post more footage when I get them.

 

[Miss Lydia]

Actually Pekins grow so fast it could actually be the same age of the Blacks. Do you know where they got the ducklings?

 

[Quackers3211]

They sound female to me as well. The white seems to me a pekin and I have something simalar to the two little black ducks. Let me know what you think they are when you see them. I still can’t figure out the breed of mine lol.

 

[Duckstruck]

Actually Pekins grow so fast it could actually be the same age of the Blacks. Do you know where they got the ducklings?

My best guess would probably be a feed store. They were bought around Easter, and stores sell them young. I'd estimate that they're around 7 weeks old?

 

[Lil Drake40]

They are adorable.