Thirty years ago he was one of the stars of the iconic sitcom “Growing Pains,” and now Alan Thicke has his own reality show, “Unusually Thicke.” He tells TODAY’s Billy Bush and Tamron Hall that he and actress Joanna Kerns, who played his wife on “Growing Pains,” did consider having an off-screen relationship at the time, but ruled it out when they realized that the show might last longer than the relationship.