Patrick Dempsey's Sisters: All About Mary Dempsey and Alicia Hatten

The actor and his sisters grew up together in Maine, and worked together on a cancer support center to honor their late mother

Meet Patrick Dempsey's older siblings.

The Grey's Anatomy alum is the youngest child and only son of William and Amanda Dempsey, who were also parents to daughters Mary and Alicia Dempsey.

In contrast to their high-profile actor brother (who was recently named PEOPLE's "Sexiest Man Alive" for 2023), his sisters live much more private lives.

However, the siblings' professional lives have crossed in another way. While neither Mary nor Alicia are actors or racecar drivers, they've teamed up with Patrick on a familial pursuit in honor of their late mom Amanda, who was diagnosed with cancer in 1997 and died in 2014.

Together, they co-founded The Dempsey Center, a non-profit cancer support center established in 2008. Patrick, Mary and Alicia have hosted public events and fundraisers over the years in support of the organization and in tribute of their family name.

"My mother was a fighter and that gave us energy as well, and she got energy from us by being there," Patrick once said of his mom. "I think that was the thing that was surprising, is her resilience that gave us strength too — and that's a part of us now."

He explained how his sister was "very much on the front line with the doctors," and worked "to keep my mom active with projects around the house," like remodeling and restoring old homes. Patrick said she would always find ways "to keep positive" and "get her out of bed in the morning."

Read on to learn more about Patrick's sisters, Mary and Alicia.

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Mary Dempsey

Mary Dempsey is Patrick’s sister and the middle of the Dempsey siblings. She grew up alongside her brother and sister in Buckfield, Maine.

Along with Patrick, she is co-founder of The Dempsey Center, a nonprofit cancer support center established in 2008 to honor their mother Amanda Dempsey who passed away in 2014 at age 79.

The family navigated their cancer journey after their mom was diagnosed with ovarian cancer in 1997. The Dempsey Center was founded in collaboration with Central Maine Medical Center (where she’s worked for over 35 years) as a resource to support others impacted by cancer navigate journeys of their own.

After 10 years of service, Mary stepped away from The Dempsey Center when it formally separated from Central Maine Healthcare in 2018 to become its own nonprofit, also adding a second location.

Related: Patrick Dempsey Wins Over Venice Film Festival Crowd with His Charming Looks — and Silver Hair!

Less than six months later, she continued similar efforts and took on an executive role at the Cancer Resource Center of Western Maine in Norway.

“My heart will always be with The Dempsey Center because that’s what I helped create for our mom, but I also have room in my heart for another center here in Western Maine and I’m really thrilled about being here,” Mary said, reported the Sun Journal.

In May 2015, Mary received an honorary doctor of public service degree from Saint Joseph’s College at the school’s 102nd commencement ceremony. In addition to her work in med, Mary is certified in reiki and works as a laughter yoga instructor.

“Life is all about making a difference, giving back, being kind, and don't forget to breathe and laugh along the way,” Mary’s LinkedIn bio reads. “Make each day count, everyday is a gift.”

Alicia Hatten

Alicia Hatten (not pictured) is Patrick Dempsey’s eldest sister. She also grew up in Buckfield alongside her brother and younger sister Mary, and resides in Florida now.

In comparison to her siblings, details about her personal life remain more private. However, she’s been involved in The Dempsey Center alongside Patrick and Mary, in 2014 joining them onsite to dedicate a flower garden to the center in their mother's honor.

In 2020, she opened up about the Amanda Dempsey Award, an honor that has been included in "The Dempsey Challenge," an initiative created to benefit the Center.

Related: Patrick Dempsey on His Mom's Legacy After Losing Her to Cancer: 'This Is the Purpose for Living' (Exclusive)

“It's a way of paying tribute to our mom and also it's a way of keeping her memory alive," Alicia said during the virtual awards presentation via Zoom.

Alicia was photographed alongside her mom, Mary, at the Dempsey Challenge in 2011. The two were pictured looking at each other and smiling as they carried a banner filled with signatures.

Another photo captured Alicia at The Dempsey Challenge in 2014. She was pictured holding a microphone alongside Patrick while they both smiled on stage.

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