(SOLVED) Single mother, little boy, happy man - family movie
I found. It was extremely hard, but I found (thanks IMDB filters) and my quote database.
The Devil and Max Devlin (1981)
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I'm looking for American family/comedy movie from the 90's. I remember that it tells the story of a about 10-year-old (maybe younger) kid who is raised by a single mother. I know that later this kid insisted that she meet such a man. This kid answered the phone, but she said: "You tell that I'm absent". Then the kid failed to lie (typical "lie" for kids): "She told me that she isn't home" and she later had to come to the phone.
Definitely not (I watched and I checked it exactly)
Sleepless in Seattle (1993)
Pay It Forward (2000)