well first of all Hens don't "have" babies they lay an egg that is fertile and an egg can only get fertile if there is a rooster in with them...the hen for the next week or so will lay fertile eggs and when she thinks she as enough eggs in her clutch she sits on them for 3 weeks until the babies hatch...as for the breed of the mother could be a Silver Penciled Cochin if she has feathers on her legs...as for the chick(s) I dont know...the eggs she is sitting on did not necessarily all come from one hen they most likely come from some of your other hens...so the breed(s) of the chicks will vary upon the breeds of hens you have and also the breeds of roosters you have.