<Tr> <Td_colspan="2"> ← Previous Season 3 Next → Season 5 </Td> </Tr> <Tr> <Td_colspan="2"> List of Mom episodes </Td> </Tr> <P> The fourth season of the sitcom Mom began airing on October 27, 2016 on CBS in the United States . The season is produced by Chuck Lorre Productions and Warner Bros. Television, with series creators Chuck Lorre, Eddie Gorodetsky and Gemma Baker serving as executive producer . The season concluded on May 11, 2017 . </P> <P> The series was created by Chuck Lorre, Eddie Gorodetsky and Gemma Baker . It follows Christy Plunkett (Anna Faris), a single mother who--after dealing with her battle with alcoholism and drug addiction--decides to restart her life in Napa, California's wine country working as a waitress at the restaurant Rustic Fig and attending Alcoholics Anonymous meetings . She lives with her mother Bonnie Plunkett (Allison Janney), who is also a recovering drug and alcohol addict . Other prominent characters in the series include the wise Marjorie (Mimi Kennedy), the wealthy and sometimes misguided Jill (Jaime Pressly) and the overly emotional Wendy (Beth Hall). William Fichtner, who plays Bonnie's wheelchair - bound boyfriend Adam Janikowski, was upgraded to series regular status for this season . The episodes are usually titled with two odd topics that are mentioned in that episode . </P>

Who plays adam's brother on the series mom