Dee Dee Hutchinson is the legal daughter of Tony Hutchinson and Diane O'Connor, and the biological daughter of Tegan Lomax and Fraser Black. She was switched at birth with Rose Lomax, by the nurse Mariam Andrews. However the mothers of the switched babies, Diane and Tegan, agreed to continue raising the children they had been raising.
In April 2018, it is discovered that Dee Dee has a dangerous disease. Tony and Diane are devastated, but they don't give up. Dee Dee starts a long treatment and undergoes various tests. Diane, expecting the worst, takes her daughter from the hospital to spend a day with her. She is later confronted by Tony, who convinces her to take Dee Dee back to the hospital to start treatment. but But since Dee Dee was diagnosed with a life-threatening brain condition, dad Tony believes they should tell Tegan.