Folks and Sister-in-law

Folks noun - People in general (often used in the plural).

Sister-in-law and folks are semantically related In some cases you can use "Sister-in-law" instead a noun "Folks".

Sister-in-law noun - The sister of your spouse.

Folks and sister-in-law are semantically related in relative topic. Sometimes you can use "Folks" instead a noun phrase "Sister-in-law", if it concerns topics such as member of a family.