If by "filing papers" you mean petitioning the U.S. Government for an immigrant visa that would give your brother-in-law ability to come to the U.S. and become a permanent resident, then the answer is No, you cannot file such papers. If your husband becomes a U.S. citizen, he would be able to petition for his brother's immigrant visa; but the process will take many years. On the other hand, if you only want your brother-in-law to come for the ceremony, you can write a letter to the U.S. Consul in his country, and that should help him get a visitor's visa.
Answered on Aug 21st, 2012 at 4:18 PM