According to Deadline.com, Jodi Long will star as Steve's Korean American mother (I'm having flashbacks to Margaret Cho's All American Girl) and Vivian Bang will play Steve's "long-suffering, under-appreciated younger sister."
Written by Byrne and Cheers alum Rob Long, who serves as executive producer/showrunner, Sullivan And Son is in the vein of the classic NBC comedy and takes place in a popular and legendary neighborhood bar in a working-class neighborhood in Pittsburgh. It centers on Steve Sullivan (Byrne), the son of the bar’s current owner and the grandson of its founder, who surprises his Irish-American father and Korean-American mother (Long) when he decides to leave his job as a successful corporate attorney in New York and return to the neighborhood to take over Sullivan & Son. Azlynn, repped by Innovative and Trademark Talent, will play Melanie, a regular at the bar and the love interest to Steve. Bang will play Steve’s long-suffering, under-appreciated younger sister.I know that they were initially having some trouble specifically finding a Korean woman and a younger hapa actress to play Steve's mom and sister, respectively. It looks like they opened it up a little broader to fill the roles.
I'm a little confused with the casting of Steve's sister. Vivian Bang -- who is hilarious -- isn't hapa, as far as I know. This could take some explaining. But I am glad we're one step closer to seeing this show...