1) you need to obtain letters of administration from court
2) it does not take more than 6 months
3) in Maharashtra maximum stamp duty is around Rs 75000 for LA even if porperty is valued at 5 crores
4) local lawyer can guide you as to stamp duty in UP on LA
5) after obtaining LA apply for mutation of property in name of legal heirs
6) enclose father death certificate
7) indemnity bond , affidavit
8) receipt of payment of property taxes