URBANA, Ohio -- Authorities said a 79-year-old Champaign County man and his son appeared before a judge on charges accusing them of sexual contact with two teenage girls.

A grand jury indicted Junior Gibson and his son, 33-year-old Jarrod Gibson, on several charges. Investigators said the sexual abuse may have happened with one of the victims over a period of two years.

Junior Gibson pleaded not guilty to sexual imposition and compelling prostitution. Jarrod Gibson appeared in court without an attorney, so the judge postponed his arraignment until next week.

Officials said another son, James Gibson, is also facing charges. A judge arraigned him last week.