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.
(..) he will die. And as for you, you will love me... as I loved you. You will provide me with an heir... of pure blood... so that Commodus and his progeny... will rule for a thousand years. (..)2000 Gladiator
(..) To be unable to mourn your father for fear of your brother. To live in terror every moment of every day... because your son is heir to the throne. Oh, I have wept. My son was innocent. So is mine. Must my son die, too, before you will trust me? (..)2000 Gladiator