1. Sir, please inquire from your concerned department, viz. HR, regarding your ESIC Pehchan Card and also Family Card. It is the employer or his official who usually collects the same from the appropriate Branch Office of ESIC to which you are attached. If you or your employer have not initiated action to obtain the said Pehchan Card and Family Card, then you can start necessary action to obtain such cards so that there are no obstacles/difficulties in your getting benefits, including medical facilities.
2. Pehchan Card/Family Card is a must in order to claim any benefit under the ESI Act, 1948, and rules/regulations framed thereunder. Without a valid Pehchan Card, how can the authorities differentiate between entitled or non-entitled persons?
3. However, you can request your employer-HR or whosoever the same is named to issue you a Form (the number and name may be available to said officials) duly completed certifying that you are a covered employee and entitled to medical benefits along with your family members. I feel that, based on that completed form indicating therein the name of your father as one of your family members, he will be in a position to obtain medical benefits from the appropriate ESI Hospital or ESIS dispensary to which you are attached.
4. It will also be more appropriate and better if you visit your appropriate Branch Office of ESIC to which you are attached and discuss the issue and the procedure to be followed in the situation as mentioned by you.