Do you have a broody box? Or a large crate that you can put mom and chicks in? That way she can raise them for another week with out interference from the other hens? That's what I do with mine. Separate until the chicks are at least a week old, then I give her a bit of freedom, and she'll bring the babies back to the broody box (a dog house with a door for me)
I pretty much got them in their brooder. I separated them from mommy so she could go about her business. I'm surprised that she didn't get mad at me when I took them, she didn't even seem to notice they were gone at first. When she did she must have thought "Hey where'd they go? Oh well, time to go back and make some more."
Cause she left again after I took them. That's why I said she'll probably come again with more chicks. I'm surprised she was even able to hatch any eggs at this time of year, it's been very cold lately with some light snow and frost. Looks like I got my source of future chicks, and I even get them for free.
Now I just gotta figure out what the darn brown chick is. So far the closest I've been able to find is golden cuckoo marans but those usually have white markings around their face. Whatever it is might be a rare variety or some off cross. I've been having a hard time figuring this one out. The golden cuckoos can have dark brown bodies and lighter brown heads like mine but mine only has that white on the neck / chest area.
Find out what the other parent [rooster] breed is...that should solve it or she stole eggs from the other flock's hens...See what kind of chickens they have.
Just started reading about your surprise babies. I think asking the neighbor for "chick support" would be quite funny. I am very curious to see what kind of Roo they have. I'm going to follow, just because I like a good mystery.
They are sooo cute! They both DEFINATELY have the EE genes, but I am ready to follow this post! I think you should ask the neighbor as well, it will be interesting!