If clingers is a typo and you ment Clangers that was all so the name of the t.v show they were in.

The answer to your question is that sisters, sisters and sisters are all the same word and it is a silly question.

The people who sang sisters were sisters, called Sis and Ters.

"Sisters" is the plural form of "sister," referring to multiple siblings who are female. "Sisters'" is the possessive form of "sisters," indicating something that belongs to the sisters, such as their belongings or qualities.

She has 16 sisters