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For tax purposes, there are two types of dependents, a qualifying child and a qualifying relative. There are strict requirements for both. In order for your boyfriend to claim you and your children, either of the following qualifications have to be met.
An individual must meet all 4 of these requirements in order to be considered your Qualifying Relative.
If the above qualifications are met, then he can claim you and your children as qualifying relatives.
Let me know if I can be of further assistance to you regarding this matter.
I am a different expert and although all the above is correct there is a consideration based on your state residency.
The relationship cannot violate state or local law.
This means that even if you meet all the requirements and you lived together for the entire year, if your state has laws against cohabitation (which Florida still does) then he could not claim you.
He may be allowed to claim the children provided they lived with him all year and the SSI the one received was not more than half the costs to support the child. SSI is not taxable to the child but it is considered income for support in this situation.
Florida does not really enforce the co habitation laws but they are still on the books.
Please advise if you need more information