Celebrity Parents Granger Smith Shares Heartbreaking Photo of Son Lincoln Visiting Late Son River's Grave: 'Bros' Granger and Amber Smith's 3-year-old son River Kelly died in a tragic drowning accident in June 2019 By Georgia Slater Georgia Slater Georgia Slater is an associate editor on the Parents team at PEOPLE. She has been working at PEOPLE since 2018. Her work has previously appeared in USA Today and Washington Life Magazine. People Editorial Guidelines Published on June 13, 2022 03:25PM EDT Granger Smith. Photo: Jamie McCarthy/Getty Granger Smith and his family are honoring their late son River Kelly, who died nearly three years ago after a tragic drowning accident. On Sunday, the country singer, 42, shared a heart-wrenching photo on Instagram of his son Lincoln, 8, visiting River's gravesite. In the picture, Lincoln sits on a bench at the cemetery while looking at his brother's tombstone. "Bros." he captioned the moving post. In June 2019, River died at the age of 3 in a drowning accident at the family's Texas home. Smith shared the "unthinkable" news on Twitter and Instagram at the time, revealing that "despite doctor's best efforts, he was unable to be revived." Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Granger Smith Documents 8-Month-Old Son Maverick Swimming, Honors Late Son After Accidental Drowning On Saturday, the three-year anniversary of when River was laid to rest, Granger's wife Amber Smith reflected on the day of their son's funeral with a post on Instagram. "3 years ago today we gathered as they lowered our son into the ground. I still don't think Lincoln grasped at 5 years old that his little brother was there inside that tiny Lightning McQueen casket," began Amber, who also shares daughter London, 10, and son, Maverick Beckham, 9 months, with Granger. "Toward the end of the service someone noticed a tiny rainbow in the sky in June in Texas. God was with us reminding us of His promise and presence despite the hardship and difficulties that we face in this broken world," she continued. "For a moment, it felt like a tiny bridge between heaven and earth was open. A symbol of hope, peace, faithfulness and mercy." Amber added, "God was present, River was home and we didn't quite know how, but we knew everything was going to be ok." Granger and Amber told PEOPLE in July 2020 that they will never know how River managed to enter into their fenced pool, which led to his accidental drowning, but they have since become vocal advocates for children's safety around water.