Ladies please help me!!

My co-worker (we are daycare teachers) my co worker is soooo sweet but her 2 yr old is in our class with her and Lord LORD THE FAVORITISM IS REAL!! Omg,it’s killing me and she fuss at the other babies but never ever her child!! It’s so obvious even the subs see it and I’m kinda friends with her..but the way she let her sweet baby rule her it’s ridiculous!! He is the only one in our class that gets away with anything!! How to handle this ladies?!!