Fathers long term capital gain tax exemption used by sons.

NO

Capital gain will be available only for one residential house

I read somewhere, if two adjacent flats are bought in joint name with father, capital gain exemption can be claimed....

Pls confirm....

Yes.... If you can prove that house property is a residential house property then you can claim the capital gain exemption

Various case laws are available & recently amendments also there. Please go through the same.

If the newly acquired property is not in the name of father or he is not a Co owner then no exemption can be claimed.