"It was fun for me," said Joshua, 31, who explained that being exposed to the entertainment industry helped him come out of his shell. "I got to meet a lot of people and do a lot of things."
Jessica began her career in the mid '90s on projects such as Camp Nowhere, The Secret World of Alex Mack and Flipper. Joshua's first role came in 2001 on Jessica's show, Dark Angel.
"She was gracious enough to let me do it with her," said Joshua, who was fresh out of high school when he scored the role.
Joshua made it clear that his No. 1 priority is his family, which could account for why Jessica's sudden fame felt strange to him at first.
"To me, she's just my sister -- someone I used to fight with all the time, you know?" said Joshua.
One of those fights came after a scary car accident when Joshua was just 15. Despite the lack of a driver's license, Joshua found himself drag racing in his parents' old car. In the middle of the race, Joshua lost control and left the car nearly totaled. Fortunately, Joshua escaped the accident unharmed, but he knew he wasn't out of the woods yet. He still had to face his mom and dad.
"The first person I called was my sister," said Joshua, who pleaded with Jessica not to tell their parents. "She came to get me and she was furious."
Watch the video to find out how Jessica reacted.
Joshua continues to act when he can -- most recently appearing on CSI and the upcoming independent movie, Synapse.