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Each person seperately would need to meet the requirements as a dependent. In other words if the Gross income requirement is in question then they each would need to have earned less than $3,650. Unless the earned amount is a joint venture or investment then you cannot take their totals and divide.
To be claimed as a qualifying relative, the person (each person) must meet all of the following criteria:
Not a qualifying child - The dependent cannot be a qualifying child of another taxpayer.
Gross Income – The dependent earns less than the personal exemption amount during the year. For 2009 and 2010, this means the dependent earns less than $3,650.
Total Support – You provide more than half of the dependent's total support during the year.
Relationship – You are related to the dependent in certain ways (Parent is one).
Joint Return – If the dependent is married, the dependent cannot file a joint return with his or her spouse.