Wrong information provided to Income tax department in 1998

My father purchased a flat in my moms name in 1998 showing in income tax return that she had savings as my father was working & already had one flat in his name. So income tax department was mislead by filling wrong returns. My father passed away in 2013. So if some one complains to income tax department today about it will there be any checking or investigation done. Will income tax department conduct any inquiry if some one complains today.