What is the Hal & Harper series about?

Hal & Harper follows the story of siblings Hal and Harper, played by Cooper Raiff and Lili Reinhart, as they navigate the challenges of adulthood, including their father's announcement that he's having a baby with his girlfriend.

Who are the main actors in Hal & Harper?

The main actors in Hal & Harper are Cooper Raiff, Lili Reinhart, and Mark Ruffalo, who plays the siblings' father.

When did Hal & Harper premiere?

Hal & Harper premiered at the Sundance Film Festival in 2025.

Home / Arts and Entertainment / Siblings Hal and Harper Confront Adulthood as Dad Starts New Family

Siblings Hal and Harper Confront Adulthood as Dad Starts New Family

3 Oct, 2025

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Summary

Codependent siblings Hal and Harper struggle with life changes
Their dad, played by Mark Ruffalo, announces he's having a baby
Hal is upset about their childhood home being sold

Siblings Hal and Harper Confront Adulthood as Dad Starts New Family

In the upcoming Sundance 2025 series Hal & Harper, actors Cooper Raiff and Lili Reinhart portray a pair of codependent siblings navigating the challenges of adulthood. The show, which premiered at Sundance earlier this year, follows Hal and Harper as they confront major life changes, including their father's announcement that he's having a baby with his girlfriend Kate, played by Betty Gilpin.

The news of their father's new family surprises both Hal and Harper, but it hits Hal particularly hard. He confesses to his sister that he's "really upset" about their childhood home being sold, even though he says he's "so okay" with his dad having a baby. As the siblings grapple with this shift in their family dynamic, they're also forced to reexamine their own close-knit bond and the ways it has both comforted and constrained them.