does she had any income in 2008?
was they married in 2008 or 2009?
I believe she did but it was under an inaccurate name and social security number.
The two were maried in 2008.
I suggest to file a joint tax return as this generally would provide more deductions.
You may use ITIN in place of SSN, but most likely you would not be able to file electronically - please verify with your provider.
If this case - the only option would be to mail a paper return - that will take some time and will delay refund, but eventually you will get it.
Please also verify that if children are below 17 - your son will get additional recovery stimulus credit - $300 for each child.
Let me know if you need help with reporting.