If  you cannot use (properly) their given name in the sentence, you do  not capitalize mom or dad. For example: My mom and my dad grounded  me for a week because I was bad.. In this instance you would not  capitalize mom and dad because inserting their given names, say  Joan and David, would not be correct.he names of mom and dad are proper nouns. That does not mean that you can't capitalize the words when writing a card, note, or email to you … r own mom and dad. They won't care if it's correct, they will appreciate the respect.