Hannah Wilson
Oscar is the nephew of established character Zac MacGuire, who arrived in early 2013, and Hannah Wilson (Cassie Howarth). He has a twin sister Evelyn (Philippa Northeast). Speer explained that the twins were sixteen upon their introduction, but Evelyn liked to remind Oscar that she was older by two minutes. They had a strong bond and were each other's "safety nets". Oscar disliked it when Evelyn just dived into situations and often found her annoying. The official website stated that during their early school years, Evelyn and Oscar liked to escape to a world they created when they were young. They then became "a formidable united force in their teens." In the family's fictional backstory, the twins' mother, Sarah, died, leaving them to develop a deep bond with her sister Hannah. Speer said Hannah was like a second mother to the twins, which Evelyn did not like. Following their father's death, the twins met their half-sister Denny (Jessica Grace Smith).