 Donna initially lives with and is cared for by her father , Matt Freedman ( Benjamin Mitchell ) , but after he tries to cover up a hit @-@ and @-@ run accident that Donna committed , he tells her that he must leave or face jail . Donna is hurt and humiliated when he leaves her alone . Donna eventually confesses to Elle Robinson ( Pippa Black ) that Matt has left and Donna moves in with Elle , who later becomes her guardian . At the end of 2008 , Donna 's younger brother and sister , Simon ( Mauricio Merino , Jr . ) and Tegan ( Chelsea Jones ) were introduced to the show . Merino and Jones won three @-@ month contracts with the show through a competition with Dolly magazine . It was announced that the siblings would be " Donna 's worst nightmare " and they were described as being " cheeky " and " pesky " . Robbie said she was looking forward to the arrival of Donna 's siblings and developing her character further with their introductions . She added " The more storylines I do , the more real my character becomes . Now , I can do things and relate to her and understand where she 's coming from " . 
