If you do not have any papers signed by your father stating his final wishes concerning burial, the laws of most states are that the surviving spouse, wife in your situation has the final say where your father is interned.You should start communicating with your deceased father's wife to see if some arrangements can be made to have his body returned to the United States for final burial. If it is a monetary issue, you should offer to pay all expenses for such. Your father was a United States citizen and presumably he wanted to be interned in his country, not Mexico.If his widow refuses your request, you should consult with an attorney experienced in such circumstances. In the interim, you should contact the nearest Mexican embassy where you live and discuss what needs to be done to have your father's body brought back to the United States. You should also contact the nearest United States embassy in Mexico in the locality where your father died about the protocol in returning your father's remains home.Contacting your local congress person and U.S. senator about your needs is also suggested.Good luck.