@Yu28 ,
do you still need more on this ?
@guywong wrote : "f your father's and brother's money were sitting in some U.S. bank accounts all along, there may be a gift tax filing requirement. "
This is true if, and ONLY if, the donor(s) is/are US person ( Citizen / GreenCard ? Resident for Tax purposes ) at the time of gifting. There is generally no gift tax filing ( IRS form 709 ) for Non Resident Alien ( when not connected / sourced to US ).
Agree with @guywong , that depending on the facts and circumstances you may come under FBAR and FATCA regs.
