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If your son, for example, lived with you but provided at least half of his own support, you can’t claim him as a dependent.
If he provided for the baby and the baby then you cannot claim your grandchild either.
It comes down to how much of his own support your son provided. I can give you a worksheet to fill in and calculate who, you or he, supplied the most support for him.
You would need to complete the worksheet but you do not have to send it in with your return.
If your son lived with his child and provided the support for the baby then he may be allowed to claim the child.
If he did not live with his child then he cannot claim the child as a dependent unless the mother signs form 8332.