Grace and Frankie

Grace and Frankie is an American comedy web television series created by Marta Kauffman and Howard J. Morris for Netflix. The series stars Jane Fonda and Lily Tomlin in the title roles of Grace and Frankie, two unlikely friends who are brought together after their husbands announce that they are in love and plan to get married. Sam Waterston, Martin Sheen, Brooklyn Decker, Ethan Embry, June Diane Raphael, and Baron Vaughn co-star in supporting roles. It premiered on Netflix on May 8, 2015, with all 13 episodes of the first season released simultaneously. The second, third, and fourth seasons, also consisting of 13 episodes each, have been released on May 6, 2016, March 24, 2017, and January 19, 2018, respectively.

Question: are grace and frankie sisters in the show
Answer: no