Your brother and his family would need to apply for visitors' visas. It will be difficult. His family will be required to show strong ties to Mexico. Your brother should take evidence of property ownership, employment, etc. to the interview. He should also being evidence regarding your father's condition. You can read more about the visitor visa at http://myattorneyusa.com/travel-visas.
Answered on Dec 22nd, 2015 at 5:06 AM