Should I enter my 1098-T information for scholarships and expenses if my parents already included that info in their 2016 return?

You would need to go through the motions of entering this information if you have a taxable scholarship (i.e. the scholarship is more than your qualified education expenses).

While a tax credit couldn't go on your tax return, any taxable scholarship income could only go on your tax return. When your parents entered the 1098-T and related information, they would be told if there was a taxable scholarship for your tax return.

If the scholarship is just a fraction of the expenses, then no, there's no point to entering this info.