follow this link, http://www.imdb.com/title/tt0086771/
and if it doesn't answer your question you can use the website to look up the title and look at other shows casts with the same name
Father William Gaunt, Mother Patricia Garwood, and as a replacement for the son, a first starring role for Martin Clunes. The daughter's boyfriend has done very well since, but I forget his name, as the daughter, who hasn't been seen a lot since. I should be able to find them on a TV site.