Hey Arnold: Miriam Pataki

Miriam is Helga and Olga's mother. A drunk, Miriam tends to neglect Helga and forget to pay attention to her.

Hey Arnold: Olga Pataki

Olga is Helga's older sister. She is very beautiful and better than Helga in just about every way. Her parents favored her growing up, leaving Helga feeling neglected. Helga resents Olga for this, although Olga is unaware of this and loves Helga very much. However, Olga is very emotionally insecure and tends to become manically depressed whenever she feels like she's failed at something.