However, it's important to note that "Aniya" is a very informal way to address a sister. In formal settings, you would use "Akka" or "Chechi" depending on the age difference and the specific relationship.
Here's a breakdown:
* Aniya: Younger sibling's term for sister (informal)
* Akka: Older sister or a woman you respect (formal)
* Chechi: Older sister or a woman you know well (formal, but less formal than Akka)