Bill Paxton died at age 61 on Feb. 25 after complications related to surgery, but his 23-year-old son, James, is keeping his memory alive. On Friday, the actor posted a throwback photo of him and his dad at a basketball game, writing, "Forever smiling with you." Just last week, he shared a heartbreaking snap of himself being pushed on a toy train by his dad when he was a baby and captioned it, "I'll love you forever, Dad. Could never possibly put into words how I feel about you." In the wake of Bill's death, tributes from his peers came flooding in, and one of the first people to speak out was director James Cameron, who worked with him on a number of films, including Titanic, Aliens, and Apollo 13. Bill is survived by his two children, James and Lydia, and his wife, Louise Newbury.