Lawrence, 30, will appear as the brother of Joe, played by his real-life brother Joey Lawrence. The episode, titled "The Other Longo," is scheduled to air Nov. 2.
Joey Lawrence previously told TVGuide.com that he'd love to have their other brother, Andy, 22, on at some point. He suggested that Andy possibly play a love interest to Lenox (Taylor Spreitler), Mel's niece for whom Joe is a nanny.
All three brothers previously starred on the '90s sitcom Brotherly Love.
Are you excited to see a Lawrence family reunion?