Nadia Floan, aged 34, and Nicholas Lucas, aged 29, from Ercall Close, Erdington, were found guilty of sexual offences against three children including rape, inciting a child under 13 to engage in sexual activity, engaging in sexual activity in the presence of a child and child cruelty at Birmingham Crown Court on 12 May.
Detectives from the Public Protection Unit launched an investigation after being alerted to the abuse in 2014.
The court heard that the abuse of three children aged between three and ten began in 2007 and continued for five years.
Lucas was jailed for 17 years and Floan handed a 14-year prison term; both have been ordered to sign the sex offenders register for life.
Detective Chief Inspector Dawn Miskella of West Midlands Police said: «They took full advantage of their young age and the situation in which they found themselves in order to carry out these offences.
«The children have been extremely brave in coming forward and we, along with our partner agencies and charities, have been supporting them through this long judicial process.
«This is an abhorrent crime and quite rightly they will have been jailed for a considerable amount of time.
«This investigation was a large scale investigation that has taken three years to bring to court.
«I’d like to thank them for their bravery in coming forward and disclosing what happened so we could take action against them; we never underestimate the courage needed to speak out.»
If anyone would like to report abuse they are urged to call West Midlands Police on 101.