Say, a mother is filling out a form for her daughter (patient) at the hospital. Which one should she put down in the given space - Mother or Daughter? I am assuming either one of these must be the answer since there is a colon after the of. Also, does it have to be A mother to feel like the sentence is complete. Anyway, my mother actually wrote "I am her mother" and told me to calm down... and I did, but I could always ask here on StackExchange.