The cool side is at 75 right now. I normally have it cooler then that for a brooder but hoping it'll make it till my daughter gets home at 3. If they even make it out by then. Kinda wish my girls had brooded separately. Out of 14 eggs they only actually hatched two. I have two Pekings kinda doing the same thing. Only one is truly broody the other sits for most of the day but then gets up and runs around for a few hours. But I think they keep switching eggs. I find marked ones under the wrong girl.
That should be fine then, if they hatch before then... some cobroodys do well together, some don't... and yes, they will keep stealing each others eggs... they don't look at marks and don't care whose they really are, lol...