If you know the stock was purchased when it was given to him you can look up the date and symbol
How do I find a stock price on a certain date? If it has been handed down for generations or the stock has split into different companies it can be more confusing.
Who is the brokerage firm? Try there first. OR:
Visit a financial website such as Yahoo! Finance. Enter the company's ticker symbol in the search box and click the "Get Quotes" button. Click on the "Historical Prices" or similar link.
Disclaimer: Not a tax professional. Information gathered from internet links. Anything dated in June 2019 was posted in prior years and is before the 2019 limits and changes.
