Breed/Gender us!

[NobodyWinter]

My mystery chick had a full sibling hatch a few days ago.
here they both are,
we have confirmed father is a RIR, no idea on mother. lets hear some input, I'm confused. Is this sex-linked male/ female?
Any ideas on breed and gender (if sex-linked, otherwise, good luck) would be appreciated.
THANKS

 

[jobeth3]

easter eggers?

 

[NobodyWinter]

nope, both out of brown eggs

 

[leadwolf1]

Do you have any idea of breeds for the mom? any at all?

 

[animallover505]

If it is a sex link, you got very lucky.

 

[NobodyWinter]

Do you have any idea of breeds for the mom? any at all?

not really. maybe a production bird of some kind, could have been almost anything - even a purebred. but i know not EE, cochin, and judging from the one, nothing too dark.

could really use some help figuring this out.