Your father is your male parent. Your father is usually the man who is married to (or lives with) your mother, but sometimes people's fathers do not live with their mothers.
Your grandfather is the father of your mother or father. Some other names for Grandfather are Grandpa, Gramps, Opa or Pop.
A hero is someone who is very brave and does good deeds that other people can't. Superheros are a special kind of hero that have powers that help them do things like fight crime. Superheros tend to wear costumes. A female hero is called a heroine.
A king is the male ruler of a country or empire. Kings and queens are born or married into their positions, not voted in by the people. You cannot choose to become a king.