No one is allowed to list a child as a dependent unless they lived at least 6 months with the adult. However, there is not much that can be done about 2010 taxes forms at this late date. Usually, three years after they are filed tax forms are final and can't be changed (April 15, 2011 plus 3 years was April 15, 2014).
Answered on Apr 14th, 2015 at 1:05 AM