Anna-Kat Otto is Katie and Greg's youngest daughter and the sister of Oliver and Taylor. She is 10 years old and is played by Julia Butters. She has OCD which leads to her to washing her hands a lot. She has difficulties making friends.
- She has Obsessive Compulsive Disorder (OCD).
- She has a fear of natural disasters.
- She is Katie's favorite child.
- She enjoys playing with her ponies.