Here's Robin & Linda Williams' discography on their website. It lists 16 albums going back to 1975. Click on an album title and it will bring up a list of song titles and sometimes lyrics.

I was unable to find anything in the list that matches what you quoted, but maybe you will have better luck. Maybe you will at least recognize an album title. If that fails, you could contact robin@robinandlinda.com.

Whatever you find, please come back here and post the result.