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
"He was their for me everyday of my life, he was the best father I could ask for," Rafael Ramos's 13-year-old son said.
Ben Haenow's dreams came true for a second time tonight after his debut song Something I Need was declared the UK's official Christmas No.1.
Temperatures reaching highs of 11 degrees tonight as rain and wind continues in northern England.