We'll if you have a family member that is musically inclined, it would be a good heirloom to pass if it meant something to your dad.

If not, you could sell it. I think a good starting value would be about $2,000 (depending on the condition). An easy way to list your accordion would be on Facebook (look up the group "Accordion Trader" or "Louisiana Cajun Accordions"). All the best.