Brian Stokes Mitchell's wife, Allyson Tucker, was in the ensemble of Man of La Mancha when he played Cervantes/Don Quixote.
Doug Henning's (Merlin in Merlin) wife, Debbie, was in the ensemble of that show.
Barnard Hughes and his wife, Helen Stenborg, appeared together in Waiting in the Wings. A semi-related topic regarding this show is at the 2000 Tonys, Rosemary Harris was nominated for her performance as lead actress in a play for this show, whereas her daughter, Jennifer Ehle, was nominated in the same category for her performance in the first revival of The Real Thing. Ehle beat out her mom.
In an Off-Broadway production of Long Day's Journey... at Irish Rep, Frances Sternhagen's actual son, Tony Carlin, also played her son in the play, he being Jamie Tyrone to her Mary Tyrone.
Although I did not see them, there is famous married duo of Alfred Lunt and Lynn Fontanne appearing together in many productions, and siblings Fred and Adele Astaire performed together as well.
Updated On: 2/24/20 at 03:01 AM