It is a spin-off to The Sisterhood of the Traveling Pants series as main characters Polly, Jo and Ama are about to attend South Bethesda High School, the school the original sisterhood (Bridget "Bee" Vreeland, Lena Kaligaris, Carmen Lowell and Tibby Rollins) attended.
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Tibby is mentioned by Polly, because she babysits for Nicky and Katherine, Tibby's younger siblings.
Tibby Rollins is the rebellious daughter of former radicals.
She is a member of the titular club, along with her friends Lena Kaligaris, Bridget Vreeland and Carmen Lowell.
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In 3 Willows, Polly babysits Tibby's little brother and sister.
Sonny Rollins | Henry Rollins | Rollins College | Sherrie Rollins Westin | Tibby Rollins | Ed Rollins | Jimmy Rollins | Dennis Rollins | Kenny Rollins | John W. Rollins | Walter E. Rollins | The Henry Rollins Show | Peter Rollins | James Rollins | Tree Rollins | Nice (Rollins Band album) | Michele Rollins | Edward H. Rollins |