The second Casta photo in this picture is labled "Mestizo con Española Castizo" this means a man of mixed race, of both Spanish descent and Amerindian. In this case, the child has a mother of Spanish descent and a father of three quarters Spanish and a quarter Amerindian. As depicted in the Casta painting, the family is most likely of higher class as you can see in their posture and the way they dress. They are also lighter skinned, which is considered "more beautiful" or rich and better of some sort. In relation to Nana Reya and Simonopio, you would most likely find them in a Casta painting depicting Indigenous and lower class people. Nana Reya is of darker skin, when she first started nursing Senior Morales' child, the first thing he said was "she's dark" and that was because she was clearly of lower class and she was feeding his upper class child. Siminopio is baby with a deformity and that automatically would put him in a lower part in society than others, we also are not fo Siminopios descent which makes another stigma for him as well. With these in mind it can be said that these characters would fall under that stigma and category of lower class servant-hood.
Unknown artist, “Las Castas,” Museo Nacional del Virreinato, Tepotzotlan, Mexico, via Wikimedia. Casta paintings illustrated the varying degrees of intermixture between colonial subjects, defining them for Spanish officials.