How can you fill out a form 8332 if you dont have a social security number? I am claiming my son who lives with his mother in Poland, mother is not a US citizen .

He lives in Poland but I pay 100% of his expenses and she is fine with me claiming him and willing to fill out the form 8332. The only problem is that form 8332 asks for her social security number, which she does not have as she is not a US citizen.