So, Tom was born to Gordon and Helen Cunningham. His maternal half-siblings are Mandy and Lewis, and his paternal half-siblings are Max, Jude, Dawn, and Cindy. Dawn died before Tom's birth, and Lewis committed suicide when Tom was a toddler.
After his parents were killed in a car crash, Tom lived with Max. When Max was run over and killed, Tom lived with Max's widow, Steph. When Steph died in a fire, Tom stayed with Steph's mother and stepfather, Frankie and Jack.
Jack's daughter Ruth used to be in a relationship with Tom's late half-brother, Lewis, and Jack has a daughter (adopted out) with Tom's late half-sister, Dawn. So there are several connections between Tom and the Osbornes, but they are not blood-related.