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Elder, eldest or older, oldest ? - Cambridge Grammar
ELDEST SON definition and meaning | Collins English Dictionary
Primogeniture - Wikipedia
Older and Oldest vs Elder and Eldest: The Difference - Merriam-Webster
'my eldest son' - English Language & Usage Stack Exchange
ELDEST SON definition in American English | Collins English …
What's the difference between "eldest" and "oldest"?
primogeniture and ultimogeniture - Encyclopedia Britannica
Elder, eldest (examples, how to use) – Speakspeak
ELDEST | English meaning - Cambridge Dictionary