Older (oldest) and Elder (eldest) – Elder, Eldest

Older (oldest) and Elder (eldest) – Elder, Eldest

Don’t Say:
My older brother is called John. My oldest brother is not here.

Say:
My elder brother is called John. My eldest brother is not here.

Note:
Elder can’t be followed by than Jane is older (not elder) then her sister. Older and oldest are applied to both people and things, while elder and eldest are applied to people onty, and most frequently to related people.