Noun
a person who expects to inherit but whose right can be defeated by the birth of a nearer relative
Source: WordNetI'm the heir apparent to the heir presumptive. Princess Margaret
As Edward was unmarried and had no children, Albert was the heir presumptive to the throne. Source: Internet
Eleanor became the heir presumptive to her father's domains. Source: Internet
Glorious Revolution In 1680, the Exclusion crisis occurred due to widespread objections to a Catholic serving as the King of England, since James was the heir presumptive to Charles, who was the king at that time. Source: Internet
Richard III made the boy his heir presumptive, probably in deference to Anne Neville's wishes. Source: Internet
If it had been a matter of hereditary rights the Dauphin would have been heir presumptive to the Spanish Monarchy, but Maria had renounced her claim of succession in return for the payment of a dowry of half a million gold crowns. Source: Internet