If you could post some pictures this might help, and or check replacements.com to get a ideal of value. Keep in mind the value at replacements is about 50% over market value, such as Ebay and etc. As for what to do with them, my vote would be hang on to them for family sake, espically if your father was the designer. Selling sets is really hard, unless you split the set, then this can be a lot of work. Again would love to see a pic of the pattern, thanks for posting, and welcome