My main rooster here is RJ, who's momma was a black sex-link, and his dad was a RIR. So he looks almost like your typical RIR.
So if this babies are sired by my rooster, he's more than likely the culprit and the mom could be either black sex-links, or hens that appear to be buff/black mixes (who I'm thinking are sex-linked birds, just not your typical black or red "stars").
There is another rooster (RJ's son) who resembles a leghorn with his size and such, with some interesting looking black leaking through in his hackles, but I don't think he'd be the daddy.
And like I said, the other options are the many BR roosters that greet my chickens every day.
The reason I didn't think it was lacing, or the "laced look" that some RIR hens show, is because I looked at individual feathers when I caught this little girl/guy. Most had two dark bands and two light bands on the feather, like barring.
I played around on the chicken calculator to see if a BR x red hen (or anything else) could even MAKE a red barred bird, and eventually I did end up with some red barred roosters in the offspring. The rooster still appeared black barred, but I guess I made him carry some kind of red gene? Excuse my ignorance on the dominance of chicken colors and color modifiers....I'm still in the process of absorbing it all
But my real question is, is there any way I can improve the barring in their future babies? I would love to have more red barred babies. Would getting some BR's to mix with them be the best way to go?