And for being eligible for EWS reservation, you should belong to General Category and your annual family income including all the Family members shall not exceed 8 lakhs per annum. the documents that are required

• Passport Size Photograph.
• EWS Certificate Application Form.
• Ration Card/ Epic Card/ Aadhaar Card.
• ID Proof (Voter ID, PAN Card, etc)
• Affidavit or Self Declaration.
• Domicile Certificate.
• Residential Proof.
• Land or Property Documents.
• income certificate

the process will be same if you use your father's income certificate or your husband's.

(https://www.collegedekho.com/articles/documents-required-for-ews-certificate-for-entrance-exams/)