Charles Napier, 67, the half-brother of MP John Whittingdale, was charged along with another man over alleged offences committed against an 11-year-old victim in the late 1970s.
Napier, from Dorset in southwest England, has been charged with one count of inciting a child to commit an act of gross indecency and will appear in court in London on July 29.
With him in court will be Richard Alston, 69, from Suffolk in eastern England, who was charged with five counts of indecent assault and three counts of gross indecency with a child.
The issue has risen to prominence in Britain following revelations that late BBC presenter Jimmy Saville was a serial sex offender.