hey there,

Eligibilty for the EWS category in NEET-UG

1. Those candidates whose family income is less than Rs.8 lakh per annum
2. The family must not own more than 5 acres of agricultural land.
3. The residential flat area should be less than 1000 sq. ft
4. The residential plot area should be less than 100 square yards .

and the term “Family” means  the person who seeks the benefit of reservation, his/her parents and siblings below the age of 18 years So, As your brother is above 18 you can make your ews certificate  on the basis of your father income.

hope this helps you