ALTAMONT, TN (WRCB-TV)-- The parents of two boys killed in a go-kart crash are talking about the day that changed their lives forever.

It happened in Grundy County on Saturday. It was a tragic scene that happened quickly. The two boys were riding their go-kart in their yard one minute, and the next, they went into oncoming traffic. Now their parents are struggling to come to terms with the fact that they've lost their two little boys.

"They did everything together," Wesley Keener said.

Wesley and Wanda Keener say their sons, 4 year old Calvin and 11 year old Nicholas were having fun riding their go-kart around the yard, but they picked up speed, lost control and went out onto Northcutts Cove Road. A woman was driving by at that same moment.

"As careful as you think you are, it's not enough. Never enough. They could still be gone in less than a blink of an eye," Wesley and Wanda Keener said.

"I could see them laying down in the road. The most awful screaming. The parents was just screaming. It was so awful," neighbor Kathy Richardson said.

Little Calvin died instantly. A helicopter flew Nicholas to Erlanger, but he passed away shortly after. The Keeners have this message to other parents.

"Cherish every second with them. every second you've got. Treasure it with all your heart because they could be gone," Wesley Keener said.

As they receive friends and family, they're trying to focus on happy memories of the boys.

"Calvin was in head start. He got awards. He was winning writing awards and learning his alphabet awards," the Keeners said, "Nicholas, he loved to read. He loved to draw. They loved each other so much."

A sign outside Nicholas' school shows the community is grieving with the Keeners. They say they need all the support they can get.

"There's nothing. There's no comfort," Wesley Keener said.

"All the neighbors around here, our prayers go out to them and if there's anything that we can do, we want them to let us know,' Richardson said.

Monday's visitation goes until 10 p.m. Calvin and Nicholas will be laid to rest Tuesday at 2 p.m. Donations are being accepted at Layne Funeral Home in Palmer.

No criminal charges are being filed against the driver. Community members say they're also thinking of her during this tough time.