My elder/eldest son / My younger/youngest daughter

Hi everyone,

This has been confusing for years, although I think I use these terms correctly.

So my elder son is not as old as my oldest son?

And my younger daughter is not younger that my youngest daughter.

Do I see that correctly? If I’m worng, would you please explain how I can use elder and eldest and younger and youngest correctly?

Thank you very much.


“my elder/older son” refers to the older of two sons.
“my eldest/oldest son” refers to the oldest of more than two sons (sometimes you might also hear it used in the case where there are only two sons).

Similarly for “my younger/youngest daughter”.