It's Harrison Ford's 18-year-old son, Malcolm. Malcolm's mom is Harrison's second wife, writer Melissa Matheson. The couple also has a daughter, 15-year-old Georgia. But wait, there's more. The 'Indiana Jones' star has two other children with first wife Mary Marquart, Ben and Willard. And now he's also playing dad to girlfriend Calista Flockhart's 5-year-old son, Liam.