[RadioKid]

When elder people call younger relatives, they use individual names (often with -CHAN for under ten or KUN(boy)/SAN(girl) over ten) instead of relative relations.

On the other hand, younger relative call elder relatives by relative relations like as "OJIICHAN:grand father" or "OBAACHAN:grand mother". "-CHAN" is usually used by children but a person become small children in front of their elder relatives.

Younger relatives never call elder relatives by name.