If you are paying more than half of the support of your grandsons, and they lived with you for more than half the year, then you can claim them, assuming that their mother will not. You can also claim your son if he earned less than $4,050 in 2016. If his grandma is your mother or mother-in-law and you paid more than half her support, you can claim her even if she did not live with you.
This article explains the rules
for claiming dependents.
Here is a worksheet
for calculating support.
To claim your grandsons, simply enter them as dependents under the Personal Info tab at the top of the screen. Here is more info about how
to enter a dependent in TurboTax.
