what's in a name?

so we have decided to order r's stocking for next year from pottery barn kids. this simple decision turned into a , 'well maybe we should order ourselves stockings, as well.' great. except for the fact that we know r's name. but we are not sure what he will call us. we kind of are thinking we are going to wing it and see what he comes up with, but i'm not sure how we will refer to ourselves in the first person when we are speaking to him about us. hmmm. i think that 'mama c' and 'mama s' is too not exactly right. mama and mommy? perhaps, but who is who?
mamma mia, i tell ya!