DUBUQUE, Iowa (AP) — A Dubuque man and his wife have been accused of stealing more than $200,000 from his 90-year-old mother. Dubuque County Court records say 64-year-old Howard Derby and 50-year-old Patti Derby are charged with felony dependent adult abuse-exploitation. Court documents say his disabled mother moved in with the couple and that he has been given power of attorney for her finances and medical needs. The documents say the Derbys took money from her accounts and used it to buy cars and pay for vacations, among other things.