Property

My father-in-law purchase property in 1978 and build 2 floors building in 1984 and in 2017 gift deed done to my wife (his daughter) and we demolished old building and started construction and from somewhere one person has sent a legal notice that the property is in the name of his grand father in old revenue records whereas we hv all the documents like mother deed,sale deed, A khatha and tax paid for last 30 years in BBMP records, power connection, water connection, kindly let me know hw to go about it.