The brother of US Representative David Cicilline has regained his law license, more than five years after losing it for orchestrating a courthouse corruption scheme. On Thursday, the Rhode Island Supreme Court reinstated the license of John M. Cicilline, 56. The court wrote that Cicilline’s ‘‘conviction arose from a misguided attempt to assist a client’’ and that they believe he has been rehabilitated. Cicilline pleaded guilty in 2008 to federal charges of conspiracy, obstruction of justice, and making false statements and was sentenced to 18 months in prison. He acknowledged he told clients he could set up drug deals in order to win leniency for them.