Lisa Jakub, Mara Wilson and Matthew Lawrence played the children in the family favourite.
Brosnan filmed the get-together, telling them: "Love you all so much."
Late comedian Robin Williams starred as the dad who is kicked out but returns in disguise as a female housekeeper.
Former James Bond star Brosnan played his nemesis Stu, the new boyfriend of Williams' character's wife, who was played by Sally Field.
Field was unable to join the reunion because she was on a book tour.