The couple were found guilty of rape, aggravated sexual assault of children, forced prostitution and distribution of child pornography between May 2015 and August 2017.
Child welfare authorities in Baden-Wurttemberg have been heavily criticised for failing to stop the couple’s abuse, according to local media reports.
Following the two-month trial, the pair were also ordered to pay more than €40,000 in damages to the boy, who was aged nine when the proceedings began and is now living with foster parents.
On Monday, the court also jailed a Spanish man to 10 years in prison for repeatedly sexually abusing the boy.
Five other men have also been prosecuted in connection with the abuse.
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