"He's just like I'm a real-life superhero. He says I'm going to save my baby brothers," said his mother, Robin Pownall

In two weeks, a 4-year-old boy will head to the hospital to save the lives of his younger twin brothers.

Michael Pownall, of Philadelphia, Pennsylvania, will undergo a bone marrow transplant on March 8, because he is the only match in his family for the 4 month old twin boys.

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“He goes to the doctor when he gets the labs for the pre-testing and he says, ‘Look how strong I am,’ and he gives them willingly his arm to get blood work,” his mother, Robin Pownall, told Good Day Philadelphia. “The nurses are amazed. They’re like, ‘I cannot believe how brave he is,’ and he really is. It gives me chills.”

“He’s just like, ‘I’m a real-life superhero.’ He says, ‘I’m going to save my baby brothers.’ ”

The twins, Santino and Giovanni, were diagnosed with Chronic Granulomatous Disease, a rare immune disorder, and they are now in need of a stem cell transplant. The couple’s oldest son, Dominick, was also born with the condition, but received a stem cell transplant from an outside donor. Only one in 500,000 people are diagnosed a year, according it to the news outlet, and it mainly affects boys.

Image zoom Santino and Giovanni and Pownall Go Fund Me

“We knew it was a chance but for it to happen again to both babies we were in shock at first,” Pownall told the news outlet. “Doctors determined Michael was a match for both of his twin brothers. A few hours after the transplant he will get to watch his baby brothers infused with his bone marrow.”

Robin and her fiancé had to quit their jobs because she’s at the hospital with the twins when he’s home with Michael and Dominick. They have since created a GoFundMe page for people to help with medical expenses and bills.

Their mother is in awe of how courageous Michael has been to help his baby brothers.