Form 3520 is for reporting transactions with foreign trusts or persons. You can review information about that form at the website <a rel="nofollow" target="_blank" href="
https://www.irs.gov/uac/About-Form-3520">https://www.irs.gov/uac/About-Form-3520</a>
I would look into an estate return. It may be necessary to file an estate return for your father. You can review the IRS information on Estate Tax returns at the website: <a rel="nofollow" target="_blank" href="
https://www.irs.gov/pub/irs-pdf/p559.pdf">https://www.irs.gov/pub/irs-pdf/p559.pdf</a>
