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  1. Elder, eldest or older, oldest ? - Cambridge Grammar

  2. ELDEST SON definition and meaning | Collins English Dictionary

  3. Primogeniture - Wikipedia

  4. Older and Oldest vs Elder and Eldest: The Difference - Merriam-Webster

  5. 'my eldest son' - English Language & Usage Stack Exchange

  6. ELDEST SON definition in American English | Collins English …

  7. What's the difference between "eldest" and "oldest"?

  8. primogeniture and ultimogeniture - Encyclopedia Britannica

  9. Elder, eldest (examples, how to use) – Speakspeak

  10. ELDEST | English meaning - Cambridge Dictionary