Tax on gift

YES the interest income will be clubbed in the income of guardian whose income is higher  . . . 

Parents and children falls under the specified list of 'relatives' who are exempt under the Income Tax Act as recipients of gift money. Therefore, in the example you have cited, the son will not have to pay any tax on the Rs 3 lakh gift amount. However, he will be liable to pay tax on any income derived from it.