LEWISTON — A Niagara County grand jury is expected to begin hearing evidence in the case of a Lewiston teen already charged with multiple counts of rape and sexual abuse tied to parties that took place in a Mountain View Drive home.

The crimes reportedly occurred during alcohol-fueled gatherings that took place in 2017 and this year.

In addition to the charges against the teen, Niagara County prosecutors have also charged his mother, stepfather and an adult family friend with supplying booze for the parties. 

Tricia Vacanti, 47, the 17-year-old's mother, Gary Sullo, 53, his stepfather each face multiple counts of unlawfully dealing with a minor and endangering the welfare of a child. Jessica Long, a friend of the family, has been charged with single counts of unlawfully dealing with a minor and endangering the welfare of a child.

Those cases are pending in Lewiston Town Court.

The 17-year-old boy, who will be the target of the grand jury investigation, faces up to six counts of first- and third-degree rape and second-degree sexual abuse. That list of charges could grow as the grand jury hears testimony from at least four victims.

The charges against the teen are felonies. The counts facing the adults are misdemeanors.

The Mountain View Drive home had become infamous among local teens who reportedly referred to it simply as "the party house," according to police officials. Word of the activities at the home leaked out after a tip call that was followed up on by New York State Police investigators at the Lewiston barracks.

The teen is currently free on $5,000 bail and has left a the private high school that he attended.

The investigation has also led to the relocation of a foreign exchange student who has been staying at Vacanti and Sullo's home. The student had been attending Lewiston-Port High School.

School district officials said they were contacted in September by state police investigators who wanted top speak to the student. The organization that supports the exchange program then decided to move the student to another home in the Lew-Port district.