Confusion over balance sheet and itr form

Hi I was working for 7 years in it industry and was filing my income tax as itr 1. I didnt prepare any balance sheet . Two year ago i left my job n joined my father s budiness as a employee from where i withdraw salary. I have purchased a plot from my money and tramsation was all in cash. Last time, i met one of the lawyer , he told me this is illegal and i need to show all money thru balancesheet. How to prepare balance sheet for last 7 years. I m confused. Need help. Also which itr i need to fill as from last two years , i m getting salary from my father s firm less than 2.5 lac.