The Prince of Wales is (the) 'heir apparent' to the throne of England.
The coach named her assistant as her 'heir apparent'.
She is the sole 'heir to' her family's fortune.
(..) Because my lord Beowulf is a mighty hero, and because he killed the demon Grendel, and laid it's mother in her grave. -To Beowulf! and because I have no heir... I have no sons, I declare that on my death, all that I possess, my kingdom, my hall of sadness and shame, and even my lovely young queen, (..)2007 Beowulf
(..) spread the word! Yes my Lord. Tomorrow will be a glorious day of rejoicing. A nightmare is over. Come to bed, my sweet. My kingdon need a heir, and I need a son! It's time you did your duty. -How can i ever lay with you knowing you laid with her? I should never have told you. (..)2007 Beowulf