I'm so sorry to hear of your loss.
You may be able to get a transcript of his 2019 tax return from the IRS, if you have enough personal identifying information. Here is a link to the website:
https://www.irs.gov/individuals/get-transcript
On the subject of stimulus checks, if he filed a 2019 or 2018 tax return, he should have received both the 1st and 2nd round stimulus checks. Also, since he is deceased, he would not be entitled to a stimulus check if he did not receive it already.
You can file his 2020 tax return based on the tax information you have. If there is more information that the IRS has, they will adjust his return after they process it accordingly.
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