Ben's younger sister Caitlin Atkins (Emily Milburn) was later introduced to show. Caitlin causes various problems for Ben with her troublesome behaviour, such as making up stories about his childhood and spending a number of nights "out on the town." Cousins sympathised with his character, as he has two younger sisters himself. He used his experiences to aid his research for the scenes with Milburn. He also admitted there were "quite a few similarities to the Caitlin thing", but his sisters were not as bad as her.