State prosecutors said Heather Buhr and Isaac Butts are accused of stealing more than $53,000 from the 83-year-old victim between February and March of 2018.
They said Butts and his daughter are facing one count each of theft/financial exploitation of a vulnerable adult.
It was unclear Wednesday if either Buhr or Butts has a lawyer yet who can speak on their behalf.
Authorities said the victim hired a company to provide a caregiver to assist with daily living services.
Buhr was a caregiver working for the company and began providing living assistance to the victim in December 2017.
While working for the victim, Buhr allegedly introduced her father to the victim.
The case is being prosecuted through the state Attorney General’s southern Arizona office in Tucson.