Tragedy struck last week when David and Sabrina Jaramillo took their family to an amusement park to celebrate their eldest son's birthday. A tragic accident occurred on a raft water ride which left one of their children dead and another in a coma.

"I will never get a chance to see him grow up or get a chance to see him, graduate," Sabrina Jaramillo told ABC News in an interview airing Tuesday on Good Morning America.

"He was just taken from us," David Jaramillo added. "Love your kids. You just don't know when they'll be taken."

They had been on a few other rides around Adventureland Park, a family-owned amusement park in Altoona, Iowa, before getting in line for the Raging River rapid ride. They boarded a raft with their fifteen-year-old son, David, their eleven-year-old son, Michael, their youngest son, Gus, and their niece, Mila. As they began the river rapids ride, their tube suddenly flipped over, trapping them all underwater.

"I see the silhouettes of my sons trying to grab each other, grab us," the father recalled. "They want us to help them. We couldn't do it."

Luckily, both parents, their youngest son, and Mila managed to escape and reach the surface, but David and Michael were still stuck with no way out.

"I'm drowning," the father said. "The river was so intense, it was like a suction."

They screamed for help which alerted first responders, who jumped in the water and eventually managed to get the boys out of the tube.

Both David and Michael were transported to a local hospital in critical condition, however, Michael died from his injuries on Sunday, while David remains in hospital in critical condition.

"Our thoughts and prayers are with the Jaramillo family as they navigate the heartbreaking loss of their child," police said in a statement Monday. "Altoona Detective is working with the State Inspector and Adventureland Park to understand this tragic accident."

The Jaramillos described Michael as a "good kid."

"His heart was bigger than him," the father told ABC News.

"He was a baby and I feel like Adventureland robbed me of my baby," the mother added, breaking down in tears.

Adventureland Park said in a statement Sunday that it was "saddened to learn of the passing of one guest." An investigation into the incident is still going on and the ride remains closed for a "thorough inspection," the park said. The Raging River ride was last inspected on Friday and "was found to be in sound working order," according to the park.

"Adventureland is working closely with both the State and local authorities, and would like to thank them again for their efforts," the park added. "At this time, we ask for your thoughts and prayers for the Guest and their family, as well as for our team members who were on site."

Despite what happened, the attorney for Adventureland Park insisted that the Raging River ride is "safe."

"The Raging River ride has been in operation for nearly four decades," the attorney told ABC News in a statement Monday. "The ride was inspected by the State of Iowa the day before the incident and was in good working order."

The Jaramillos have spent the last couple of days by Davids' side as he is treated for his injuries, and are hopeful he will make a recovery, with his sixteenth birthday on Wednesday.

Their youngest son, Gus, is finding it difficult to cope with what happened to his older brother.

"He's scared. It is a nightmare," the father told ABC News. "He closes his eyes and thinks about the water. When he wakes up, he realizes the nightmare's true. So there's no peace."

Rest in Peace, Michael. Our deepest condolences go out to the Jaramillo family during this terrible time.