Read the I-539 instructions. This information is there or seek assistance of an experienced immigration attorney in DC.
NYC EXPERIENCED IMMIGRATION ATTORNEYS www.myattorneyusa.com; email: firstname.lastname@example.org; Phone: (866) 456-8654; Fax: 212-964-0440; Cell: 212-202-0325. The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter.
You should contact an immigration attorney. There are various other types of evidence you can use.
Alexus P. Sham email@example.com (917) 498-9009. The above information is only general in nature and does not constitute legal advice. It does not create an attorney-client relationship.
Best to seek the advice and counsel of a local immigration lawyer in preparing an application for extension of stay. Those are hardly ever granted to individuals wanting to use "self-help" and file the application themselves. A skilled immigration lawyer will know how to help you prepare an approvable application.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Get evidence of money being wired monthly to your account, and a letter from your father stating his intent to continue sending you money. Make sure you file the extension before your current status expires and you will be legally in the US while the extension is pending.