Hi,
It will be a long term capital gain and date of purchase of property by your father (Nov 2010) will be considered as reference point for calculation and long term capital gain.
You can minimize capital gain taxes by availing exemption under section 54. The most common exemption which people prefer is as follows:
1. Buying an another residential house within 2 years of sale or construction of residential house prior to one year of sale or within 3 years of sale.
2. Subscribe to NHAI/REC bonds within 6 months from the date of sale.
The step by step process will differ based on the option you choose for exemtpion.
Please let us know your choice and we will guide you.
Trust the above adequately clarifies.
Should you have any further question, please feel free to call/revert.
Thanks and Regards
Abhishek Dugar
CA CS B.Com