The project, which is currently in development, follows two feuding Long Island families whose lives change when one of their daughters is diagnosed with cancer. The idea came from the sisters, who will produce, and marks Millie's first collaboration with Netflix outside of Stranger Things.
"We are so grateful to Netflix for their confidence in us and this beautiful story, which we have spent years writing and developing. It's about friendship, family and overcoming obstacles when it feels like the world is pushing you down. It's been a labor of love, literally," the Brown sisters said in a statement to Deadline.
No word yet on who will lead the cast but we're holding out from an appearance from her Stranger Things co-stars.
Stranger Things Seasons 1-3 are currently streaming on Netflix.