"We have been blessed to have our children meet and get to spend time with their great-grandparents," said Trista Larson, who shared a photo of her 80-year-old grandfather Bill and her son Arny with Huff/Post50. "We make sure to tell them every day about their great-grandparents to keep them always in their hearts." She said she loves the way the "forever young" Bill gets down to Arny's level to play.