By Sarah N. Lynch WASHINGTON (Reuters) -An associate of the far-right Three Percenters militia could be sentenced to more than a decade in prison on Monday for joining the riot at the U.S. Capitol on Jan. 6, 2021, while armed and threatening to harm his own children if they ratted him out to the FBI. Guy Reffitt, of Wylie, Texas, was convicted by a jury in March of five felony charges, including bringing a gun onto the Capitol grounds and obstructing an official proceeding. Federal guidelines recommend a prison sentence of 7.25 years to 9 years for those crimes, U.S. District Judge Dabney Frie…