This seems like it might be an obvious question, but I honestly do not know. My fiance and I have decided that we'd like one of my cousin's sons to be our ring bearer (he's aged 8), and one of his cousin's daughters (she's aged 4) to be our flower girl. Do we let their parents know we'd like to ask their children to be in our wedding party even though they won't be as a courtesy before we ask their children?