Christopher Guest has added three new people to the cast of his HBO series Family Tree. The show will be his return to writing/directing after six years away that’s expected to run 8 episodes on HBO and BBC Two next year. Deadline reports that Nina Conti (Four Your Consideration) and UK actor Tom Bennett will be regulars on the series, whereas Amy Seimertz (Tiny Furniture) has been hired for a recurring role. As previously reported, the show centers around Bridesmaids’ Chris O’Dowd as a guy who sets off on a journey to learn more about his family after getting fired and dumped. Christopher Guest regulars Michael McKean, Ed Begley Jr., and Fred Willard are all playing recurring roles, as well. Still no sign of Eugene Levy and Catherine O’Hara, begging the question, “Does it still count as a Christopher Guest comedy without them?â€