add original PAN
Initially when the system was made there was no verification. So at that point of time many people added fake PAN numbers. Paypal must have found it out and now they have started with verification and have limited all the accounts without a proper PAN number.
Be ready to attend call from Paypal after you have added your own PAN card details not your Fathers. They will call you to know the purpose of your account and the details about last transaction you made. Good Luck