Updated: August 19, 2026
Lena Dunham, the writer, director, and actress best known for creating and starring in the HBO series Girls, has often spoken openly about her family. When people search for Lena Dunham siblings, they discover she has one younger sibling: Cyrus Grace Dunham. Once known publicly as her sister Grace, Cyrus is a transgender man, writer, and activist. Their relationship has evolved over the years through shared childhood, creative collaboration, and public challenges.
Table of Contents
Early Family Life in New York
Lena Dunham was born on May 13, 1986, in New York City to artist parents Carroll Dunham, a painter, and Laurie Simmons, a photographer and artist. Her younger sibling, Cyrus, was born on January 28, 1992. The two grew up in Brooklyn and spent summers in Salisbury, Connecticut. Their artistic household encouraged creativity from a young age. Cyrus appeared in Lena’s early short films and played a major role in her breakthrough feature Tiny Furniture (2010), which was filmed in the family’s actual home and featured their mother as well.
The siblings shared a close but complex childhood bond that Lena has described in her writing as both formative and mysterious.
Cyrus’s Transition and Lena’s Support
Cyrus came out as transgender and now lives openly as a man. Lena has spoken publicly and warmly about this chapter of their family story. In a 2025 speech at a Transgender Day of Visibility rally, she said that when her sibling came out, she realized she “never had a sister at all, but a wise, funny, resilient, powerful, remarkable brother.” She called the experience of supporting Cyrus’s transition “a profound gift to our family,” noting that it brought laughter, tears, learning, and deeper connection.
Lena has long been an advocate for LGBTQ+ rights, and she credits Cyrus’s journey with expanding her own understanding of gender and identity.
Public Moments and Relationship Challenges
Their relationship has not always been simple. In her 2014 memoir Not That Kind of Girl, Lena included childhood anecdotes involving Cyrus that later drew heavy criticism and accusations of inappropriate behavior. Conservative media outlets seized on the passages, creating a major controversy. In her 2026 memoir Famesick, Lena revisits the episode, acknowledging the pain it caused and describing how the two worked to repair their bond in the years that followed. She has emphasized that Cyrus supported her at the time and that the experience taught her important lessons about privacy and public storytelling.
Key points about their relationship include:
- Cyrus appeared in Tiny Furniture as the on-screen sibling.
- Lena has repeatedly called Cyrus one of the most important people in her life.
- Both have spoken about the lasting strength of their sibling connection despite past tensions.
- Cyrus pursues independent work as a writer and activist while maintaining a lower public profile than Lena.
Quick Facts Table
| Detail | Information |
|---|---|
| Sibling Name | Cyrus Grace Dunham |
| Birth Date | January 28, 1992 |
| Relationship | Younger sibling (transgender brother) |
| Parents | Carroll Dunham and Laurie Simmons |
| Notable Work | Writer, activist; appeared in Tiny Furniture |
| Public Mentions | Featured in Lena’s memoirs and public speeches |
Conclusion
Lena Dunham has only one sibling: Cyrus Grace Dunham. Their story reflects a modern family navigating art, identity, public scrutiny, and genuine care. From sharing a childhood in New York to collaborating creatively and supporting each other through personal transitions, the two have maintained a meaningful bond. Lena’s recent reflections in Famesick and her public comments show ongoing respect and affection for her brother. For fans of her work, understanding this sibling relationship offers deeper insight into the personal experiences that have shaped one of the most distinctive voices of her generation.