Susan and Christopher Edwards will remain in custody until their appearance before Nottingham magistrates tomorrow, police said.
The pair, of no fixed address, have been charged with murder after the remains of a man and woman were found buried in the back garden of a house in Mansfield on 9 October.
Following a post-mortem examination, a Home Office pathologist determined both died as a result of being shot.
Formal identification has yet to be confirmed, but detectives believe the remains are that of William and Patricia Wycherley who lived at the house in the 1990s.
More top news
A baby who was unable to tell which of two identical twin brothers was his father has been watched millions of times online.
Ewan Williamson,14, died from heatstroke in Australia after police took almost an hour to respond to his distress call, an inquest heard.
Explosives and suicide vests have been seized from a group of suspects stopped on Turkey's border with Syria, the Turkish army has said.