Minnesota ? The father of a 13-year-old cancer-stricken boy who went on the run with his mother to avoid chemotherapy treatment pleaded Thursday for the return of his son, asking his wife to “do what’s best for Danny.”

“If you’re out there, please bring Danny home so we can decide as a family what Danny’s treatment should be,” Anthony Hauser said in a brief statement to his wife, Colleen.

Daniel Hauser has Hodgkins’ lymphoma, a highly curable cancer when treated with chemotherapy and radiation. But the Hausers preferred alternative remedies, and Daniel and his mother fled Monday, a day before a court hearing that could have resulted in a judge ordering chemotherapy.

The two were seen in Southern California on Tuesday morning and authorities have said they could be in Mexico.

The American Cancer Society estimates that 35 to 50 clinics along the Mexican border attract cancer patients looking for alternatives to traditional U.S. treatment methods. Many have offices in San Diego that serve as contact points for U.S. patients.

The sheriff’s office in Brown County, Minn., issued a felony arrest warrant Thursday for Colleen Hauser and the FBI was helping with the search.