Minor becoming major.Tax consequences

When minor becomes major at anytime previous year lets say on 1/1/08 during previous year 2007-08 whether his income would be clubbed with the income of his parents or whether he has to file seperate return of income if his income during the previous year exceeds maximum amount not chargeable to tax as he is now major or whether his income would be divided into two parts,upto the date he attains majority his income would be clubbed with income of his parents and after the date he has attain majority he has to file seperate return of income?