Jack Nicholson's grandson, Sean Knight Nicholson, has been arrested for domestic violence. Sean, 29, was booked in Los Angeles for a felony on Tuesday, August 5, according to police records viewed by Us Weekly. He was released that same day with a bail of $50,000. Sean is scheduled to appear in court later this month on August 26. The Sun reported on Thursday, August 7, that Sean has been accused of attacking a woman and was arrested for domestic violence.