Gage Bingham, left, of North Powder, underwent heart transplant surgery Wednesday morning in the same California hospital where his two older sisters had heart transplants several years ago. (Bingham family photo)

An 8-year-old North Powder boy underwent heart transplant surgery Wednesday morning in the same California hospital where his two older sisters had heart transplants several years ago.

Gage Bingham was diagnosed with dilated cardiomyopathy, which means his heart has grown too large to function properly.

“Old heart is out. The new heart is here. Everything is going smoothly,” Stacy Bingham, Gage’s mother, wrote on the family’s blogsite at 8 a.m. Wednesday. “Thank you all for your countless prayers. I know we are being strengthened through them. My biggest fear has been set at ease and I feel peace and complete confidence he is going to be fine.”

Two of his sisters, Sierra, 17, and Lindsey, 12, both suffer from the same malady.

Sierra had her first heart transplant in 2006. She underwent a second transplant surgery in 2015. Lindsey had a heart transplant in 2012.

The family is at Lucile Packard Children’s Hospital at Stanford University in Palo Alto.

Gage is the youngest of the Binghams’ five children.

Two of his siblings — sister, Megan, 15, and brother, Hunter, 10, have not shown signs of dilated cardiomyopathy, although both are tested.

Gage has been waiting for a suitable transplant heart for about a year and a half.

On Nov. 16, 2015, doctors implanted a device called a HeartWare in Gage’s chest to help his heart while he awaits a transplant.

The Binghams posted on their blog Tuesday morning that a potentially suitable donor heart was available, and that a doctor, who called the couple at 11 p.m. Monday, asked them to fly to the California hospital as soon as possible.

At 9:07 p.m. Tuesday, Jason Bingham posted that he was with Gage at the hospital.

“We went for a walk, went to the play room, played Mario Kart, and watched a movie,” he wrote. “His spirits are pretty mellow, not too excited and not too sad. In his prayers he prayed for a good surgery and that he would come out OK.”

Stacy Bingham helped the couple’s other children move back to the Ronald McDonald House near the hospital, where the family has stayed during Sierra’s and Lindsey’s transplants.

At 3:05 a.m. today, Stacy Bingham posted that Gage walked to the operating room while Queen’s rock anthem “We Are The Champions” blared from speakers.

“Not sure where he has heard that one, but that is what he wanted and that is what he got,” she wrote. “He was very scared and teary.”