John Charles Villiers-Farrow, the younger brother of the actress, was charged by authorities on Wednesday (November 14), according to NBC Washington.
Maryland police took the 66-year-old into custody for reportedly sexually abusing several children over a number of years.
Two men in particular have stepped forward with claims that they were abused as young boys from 2000 to 2008.
Villiers-Farrow is currently in jail on $250,000 bail. He faces charges for child abuse, sex abuse of a minor, assault and perverted practice.
Mia Farrow, who has 15 adopted children and one biological son (Ronan Farrow) with director Woody Allen, has yet to speak publicly on the matter.