Grayson was a character who was introduced as one of Luke Dunphy's friends in his SAT Prep Group in the episode "Phil's Sexy, Sexy House".
Luke, Grayson and another male friend snuck into the sexy house to drink beer and hide when they noticed other people but got found by Claire. Grayson made a flirty comment towards Claire to which an offended Luke yelled at him "Dude!". They left the house when Phil ordered them to.