FromMiddle Englishsisterne,systerne,sistren,sustren,sustern, equivalent tosister +‎-en; or alternatively modelled afterbrethren.

sistern

1. (nonstandard)Alternative form ofsistren
   • 1896, Ernest Emory Russell,The Reason why: A Story of Fact and Fiction, page29:

     But, my dear brothern an'sistern, they hain't no water down thar— it's a awful thing to think they hain't, but they hain't, b'caze the Bible says they hain't.

• cistern

• Inserts,Stiners,Strines,estrins,inserts,sestrin,sinters,sistren

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