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An heir (female: heiress) is a person who has inherited something after the original owner's death. Most often a child after his or her parent's death.
Heir apparent and heir presumptive usually refer to someone who will inherit a royal or noble title.
An heir apparent is someone who will inherit after the death of the present title holder.
An heir presumptive is someone who might inherit, unless someone with a better claim under the rules of succession is born.
- Queen Elizabeth II's oldest son is Prince Charles, so he is her heir apparent.
- Queen Elizabeth II (when she was still called Princess Elizabeth) was heiress presumptive to her father King George VI, because she was his oldest daughter and he had no sons. She was not his heir apparent, though, because if the king ever had a son he would have taken over as heir apparent.