The show was very popular in the UK, and is still fondly remembered by many. It was a family-friendly sitcom that featured a widowed father raising his three sons. The show explored themes of family, love, and responsibility.
It's interesting to note that the show's title was changed for the UK audience. It's possible that the producers felt that "My Three Sons" sounded too American, and that "The Three Sons" was more appealing to British viewers.