A Fairbanks brother and sister were sentenced in Federal Court on Friday for Heroin and money laundering conspiracy according to the U.S. Department of Justice.

Nathan Jackson, 27, and his sister, Hailey Jelinek, 20, from Fairbanks, were sentenced Friday by Chief U.S. District Court Judge Ralph R. Beistline The two were part of a conspiracy that included their mother, Cynthia “Cindy” Hawks and Jackson’s girlfriend, Fabienne Clerc.

Jackson was handed a sentence of 123 months, or 10 years three months in prison and three years of supervised release from Judge Beistline. Jackson’s sister Jelinek, received a sentence of six months in prison and three years of supervised release.

According to the Justice press release, Jackson and his mother sold heroin in Fairbanks. Jackson’s girlfriend, Fabienne Clerc accompanied Jackson on drug sales in the Fairanks area and then, like Jackson’s mother, Hawks, conducted financial transactions with the drug proceeds for Jackson in order to cover up the fact that the money was proceeds from heroin sales. Jelinek also helped Jackson hide the origin of the heroin proceeds by conducting financial transactions concealing the true nature of the money.

Jackson’s mother, Hawks also accompanied Jackson to Arizona and California when he went on his drug buys and sent the drugs to Fairbanks.

Hawks and Clerc have been previously sentenced for their roles in the conspiracy. Hawks received 32 months in prison, while Clerc received a sentence of 24 months. Both also received three years of supervised release.

During the investigation, law enforcement officers seized over $350,000 in cash proceeds from Jackson and his co-conspirators, as well as a 1995 Chevrolet Tahoe, a 2001 Toyota 4-Runner, two 2003 Sea-Doo Personal Watercraft, and an accompanying trailer. As part of their sentence, Jackson and Jelinek forfeited any ownership interest they may have had in these items.

Because of his role as the mastermind and leader of the conspiracy, Jackson received a far harsher sentence than did his mother, sister and girlfriend.

The investigation into the drug-money laundering conspiracy was conducted by the IRS Criminal Investigation Division, the DEA, Alaska State Troopers and the North Pole Police Department.