In general, if you sold the stock in a brokerage account, the broker should have a record of your original cost basis in the stock. But, if they cannot provide it to you, you will have to come up with a reasonable method to estimate your basis by reviewing the historical prices of the stock nearest to the date of your father-in-law's death. You can perform a quick Google Search using the Ticker symbol of the stock and the year in question (e.g. AAPL share price in September 1989).
Warm regards,
Tyler H.
Enrolled Agent (EA)
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