How do you say younger sister in Thai?

There are a few ways to say "younger sister" in Thai, depending on the context and formality:

Formal:

* น้องสาว (nóng sāw): This is the most common and formal way to say "younger sister."

* น้องหญิง (nóng yìng): This is a more formal and slightly less common way to say "younger sister."

Informal:

* น้อง (nóng): This is a casual way to refer to a younger sibling, generally used by family members or close friends. You can add "สาว" (sāw) after "น้อง" to clarify that you're referring to a female sibling.

* น้องสาว (nóng sāw): This informal version is used by friends and family.

Other options:

* น้องน้อย (nóng nóy): This means "little sister" and is used for a very young sister.

* น้องสาวคนเล็ก (nóng sāw khon lék): This means "youngest sister."

The best way to choose the appropriate term is to consider your relationship with the person you're talking to and the context of the conversation.