Income tax notice

I wish to ask you about my problem regarding the notice from IT dept. My brother has just yesterday (2.3.2017) received a notice for ‘Non filing of Income Tax Return’ for Fin. Yr. 2014-2015. In fact my brother is a business man and already filled income tax return timely. My brother has a ICICI Direct demat account in his name. I normally purchase share through this demat account. However, since the money transacted are mine, I used to show all taxable transactions in my income tax return (bank interests and profit/loss etc.). but not shown share transaction in income tax return. F.Y.2013-14 80000/- loss in Share transaction and F.Y. 2014-15 gain in Share Rs. 51737/- Now since this notice has been served, please help me and advise me what shall I do now.