Prequel with Amy Smart

I get a very, "Yaya sisterhood", feel from this movie. I think it would be great to hear a prequel all about the mother. The life of a free spirited, wanderlusting, dancer with 4 girls, 4 fathers, a life of adventure, intertwined with bad parenting, addictions,and eventually ALS and assisted suicide.That's the story. I loved the glimps of Amy Smart as the mother. I think this prequel would make everyone appreciate Sister cities more. You could then have enough interest in the story to have a sequel that follows the story of the sisters after. Just thoughts.