Not very credible

Overall, it was an OK and light-hearted comedy but come on, how can they expect audiences to believe that Bob Hope and Jane Wyman could pose as imposters and adopt a child just like that? This was 1969, not 1909, and I'm sure it wasn't THAT easy. Anyhow, I realize it's only a movie, yeah, yeah, but that insults my intelligence! After all, I only rented this to get a glimpse of the The Comfortable Chair.