The meatballs were from the Betty Crocker Cookbook. They were called Waikiki Meatballs. The sauce was grape jelly and chili sauce.
If they were ever cooked and served around me, the grape jelly was no more than an unidentifiable secret ingredient.
We still make them and bring to parties, never have leftovers.
This puts them back to the ‘50s, which was before my time but I could well believe:
https://www.savoryexperiments.com/grape-jelly-meatballs/