Pub 17, pg 25 -- NO dependency allowed
"Dependent Taxpayer Test
If you could be claimed as a dependent by another person, you cannot claim anyone else as a dependent. Even if you have a qualifying child or qualifying relative, you cannot claim that person as a dependent."
So, if the older sibling "could be claimed as a dependent" by his parents, (even if the parents elect not to claim him), he cannot claim anyone (i.e. the younger sibling) as a dependent.
Bill
"Dependent Taxpayer Test
If you could be claimed as a dependent by another person, you cannot claim anyone else as a dependent. Even if you have a qualifying child or qualifying relative, you cannot claim that person as a dependent."
So, if the older sibling "could be claimed as a dependent" by his parents, (even if the parents elect not to claim him), he cannot claim anyone (i.e. the younger sibling) as a dependent.
Bill
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