Dying twin Mason McIntyre was captured on a sonogram receiving comfort from his sister in the womb, and now the story is going viral.

Little Mason’s parents, Ian and Brittani, were shocked to see the babies holding hands after learning the tragic news that Mason has irregular brain function and a hole in his heart.

“His only chance of survival would be heart surgery but they wouldn’t do heart surgery on him because of his brain. We know we have a piece of them together that will last forever and it’s special to have. She’s the only one who can actually be there and holding onto him through it. So it’s comforting to know that if he does pass, he won’t be alone,” Brittani McIntyre told Brittani told KWCH.”Most twins, when she’s trying to take pictures and stuff, they’re kicking each other and hitting each other and she said with our twins it seems like she was very protective over him.”

Doctors say that if Mason survives to term, he and his sister–already named Madilyn–will be delivered via C-section.

Twins holding hands isn’t so uncommon; just last month in Australia, a couple recorded video of their babies holding hands as their father held them. The video–posted to Facebook–quickly went viral and has had millions of views.

“Amazing!!! Needs to go viral!!! our preemie twins Kristiana and Kristian! Born at just 28 weeks and 1 day! Weighed in at under a kilo each!” Anthea Jackson-Rushford wrote.