International money transfer

Hello

i need some advice about international money transfer, my mom (Thai citizen) gave me $50,000 as birthday gift but my younger brother transferred me this money to my bank account in USA (i am permanent resident), not my mother. Is it gonna be issue about person transferring money?

I just wonder when refer about gift money, it should be from parents , family member or can be anyone like friend?
Please advise, thank you very much