I just found out that my brother-in-law used my deceased brother’s green card. Is this legal?
18 U.S. Code § 1546.Fraud and misuse of visas, permits, and other documents
(b)Whoever uses— (1)an identification document, knowing (or having reason to know) that the document was not issued lawfully for the use of the possessor, (2)an identification document knowing (or having reason to know) that the document is false, or (3)a false attestation, for the purpose of satisfying a requirement of section 274A(b) of the Immigration and Nationality Act, shall be fined under this title, imprisoned not more than 5 years, or both.
Full code text here.