Olga Pataki is Helga's older sister and also the eldest daughter of Big Bob Pataki (Maurice LaMarche) and Miriam Pataki (Kath Soucie). She is voiced by Nika Futterman, who also voiced Adam Lyon in My Gym Partner's a Monkey (2005-2008) and Sticks the Badger in Sonic Boom.
- Helga Pataki (younger sister)
- Big Bob Pataki (father)
- Miriam Pataki (mother)