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.
(..) Be careful what you say. Do not look for welcome here. Oh, he must have died sometime in the night. What a tragedy for the king... ...to lose his only son and heir. I understand. His passing is hard to accept. Especially now that your brother has deserted you. Leave me alone, snake! (..)2002 The Lord of the Rings: The Two Towers