Abigail Catt, 18, and her 21-year-old brother Hadyen Catt accepted plea deals Thursday for their roles in a series of robberies.
Abigail will serve five years. Hayden will serve 10 years.
Prosecutors say the two siblings and their father robbed at least seven banks between Texas and Oregon last year.
The father, 51-year-old Ronald "Scott" Catt, is still considering a plea deal that would send him to jail for 25 years.
All three remain in the Fort Bend County Jail.