No, your father's SSLC certificate showing OBC category typically won't disqualify you from getting an EWS certificate.

An EWS certificate is for applicants belonging to the general category with a family income below a specific limit (usually around 8 lakhs per year) and not falling under any reserved categories like SC/ST/OBC.

The EWS certificate assesses your current family's economic situation, not your father's past caste category. Therefore, your father's past OBC status shouldn't affect your eligibility for an EWS certificate.

The documents required for an EWS certificate usually include:

• Income certificate for your family
• Identity proof and address proof
• Affidavit or self-declaration about income and not belonging to reserved categories
• Other documents as specified by the issuing authority (may vary by state)
  
  Even if your father no longer identifies as OBC, it won't impact your EWS application. The focus is on your current family's income and not your father's past caste status.
  
  I hope it helps!