HGTV starChristina Hall(maiden name Haack) loves to share moments from her personal life with her fans.

But those aren’t the only important people in Hall’s life.

Hall also has a younger sister, Carly Haack, who is 10 years her junior.

Christina Hall at an event

That might be because Carly’s line of work has taken her on numerous research expeditions away from home.

Hall’s younger sister has a fascinating career path in marine biology.

She currently works as a boat safety officer for UCSB.

Split image of Carly Haack and Christina Hall with her kids

At the end of the book, she included a photo of her with Hall’s kids.

When Haack isn’t working, she enjoys paddleboarding or hiking with her dog.