Where Katie and Robbie from my three sons married in real live?

In real life, Katie and Robbie from the television show "My Three Sons" were portrayed by actress Tina Cole and actor Don Grady, respectively. However, they did not marry in real life; their on-screen relationship was fictional. Don Grady was married to actress Julie McCullough from 1970 until their divorce in 1986. Tina Cole has also been married and divorced, but she and Don Grady did not have a romantic relationship outside of the show.