Wikipedia lists a movie The Sheriff and the Satellite Kid (1979) with Bud Spencer as sheriff Scott Hall and Cary Guffey as an alien boy, and its sequel Everything Happens to Me (1980), also starring them.
So Ron could have seen either or both of them. Or maybe a different movie entirely.
I note that those were not the only movies with extraterrestrial children on Earth.
There were also Escape to Witch Mountain (1975) and its sequel Return from witch Mountain (1978) with Ike Eisenmann and Kim Richards as the alien kids who are pursued by Earthlings. They were followed by a TV film Beyond Witch Mountain (1982) with Tracy Gold and Andy Freeman as the kids.
There was also a TV movie Escape to Witch Mountain in 1995.
And the movie Race to Witch Mountain (2009).
I don't remember robots with goofy sayings in any of the Witch Mountain productions I saw, so the film suggested by Clara Diaz Sanchez seems more likely.
But the example of the Witch Mountain films shows that there were other movies about the adventures of alien children on Earth. And I sort of have the feeling I might be forgetting some examples.
Mac and Me (1988) has a non-human alien child on on Earth pursued by Earthlings.
In Invaders from Mars (1953, 1986) an Earth boy has nightmarish trouble with invading Martians, who use mind control on some humans to make them do their bidding, so he doesn't know who to trust.
And no doubt there are other films which fit parts of the description in the original question.