what should i do to obtain a visa to may dad's funeral?

you will have to start with the reasons you were denied a visa.  There could be any number of reasons and you would have to start with the agency that made the determination you are not allowed to have a visa.  Did you over stay a previous visit? Does the USA not allow citizens of the country you live in to visit?  did you apply in person at the US embassy in the country in which you live or was this done by mail?  you must look at the reasons for denial to be able to address the issue, and then possibly apply for a hardship waiver.