Caitlin Atkins was the half sister of Ben Atkins. She came to live with him while her parents lived abroad. She wanted to be a professional swimmer and was very dedicated to her training. She at first fancied Billy Kennedy and tried many times to split him and Anne up. This caused much confusion for Billy who began to feel he was in love with two girls at the same time.

Caitlin eventually found her own boyfriend who studied at the Australian sports institute. She actually ran away with him once. She left Ramsay street to go and live with her parents.