David and Katerina Speers filed suit in Kane County Court late last month against the family, whose names were not reported, the Chicago Tribune reported Thursday.
The North Aurora couple allege their 16-year-old neighbor planted a wireless video camera in their bedroom while he was babysitting their child.
The suit said after discovering the camera, David Speers confronted the teen's father, who admitted he found a receiver at his home and though it was taken away from the son, the teen "regained control" of it.
The suit says the teen acted "willingly and wantonly with a conscious disregard for the solitude, seclusion and privacy" of the Speerses. The suit also says the teen's parents aided in the invasion of privacy by purchasing the camera and failing to adequately monitor their son's use of it.
The Speerses obtained an order of protection against the teen Nov. 19, two days after they found the camera, court records indicate.
North Aurora Deputy Chief Scott Buziecki said police were investigating the allegations.