
I would submit your parent's marriage certificate, also a DNA test would be the strongest proof of the basis of the application (the relationship between you and your Mother).
Sincerely,
Rehan Alimohammad
Attorney at Law & CPA
Law Offices of Rehan Alimohammad, PC
Houston Office: 281-340-2074
Toll Free: 800-814-3920
Fax: 866-240-0629
www.attorneyrehan.com