Two disc shaped objects flying in tandem

This is the first time I have officially reported a sighting.  It was in the fall; as best I remember it was 1976 or possibly 1977.  I won't go into the details of how I arrived at that date - I do not actually remember the exact date.
 I had gone to my parent's home to pick up my son - he rode the school bus and stayed at their house until I got off from work.  They needed a few items from the grocery store (about a mile and a half from their house) and I volunteered to go get them.  My son was with me.  As we drove down the road, I saw two  ojects in the sky.  They were flying at tree-top level. They made no sound. They were silvery in color.  The looked like two saucers laid rim to rim.  They had red, white and green lights. The white lights were around the middle - windows were also visible around the middle.  I stopped the car - flashed my headlights - and watched them. Nothing happened.  I continued on my way to the store.  I asked the cashier at the store if she saw the UFO's and she looked at me as if I had two heads (or no brain) and has yet to answer,  I decided at that time not to pursue it any further. I could see no movement inside the closest craft; although it seemed as if I could see in the windows.
 The next day an article was in the Knoxville News-Sentinel relating a similar sighting in a nearby county by two police officers.  They described the lights as patriotic - red, white and blue.  I did tell my parents of the sighting. My mother scoffed.  My father stated he saw them all the time in the back yard in the evening when he was feeding the animals.
 A few years ago, I remembered that after I flashed my headlights (which I had to turn on to do so), and continued down the road that I had to turn on my headlights as it was now getting dark.  I don't know if any time was lost - my parents didn't say anything about being gone a great length of time.  They are both now deceased so it will be impossible to get that input.
 My son says he still remembers the UFO's - he was about 8 years old at the time - he will be 39 this August.
Witness indicates that date of incident is approximate.  PD