“My question is can my fiance claim any or all of us as dependants on his 2011 tax returns?”---->To claim them as her dependents, either as qualifying relatives UNDER the tax law(as they are NOT her relatives actually) or qualifying non-relatives, I mean she can also claim non-relatives as a qualifying relatives.Those persons must meet the same income(your mother or your gross income for 2011 shouldn’t be more than $3,650 in 2011)and support tests(the persons, you,your bro or mother, kid did not provide more than half of his or her own support during the year.) as other qualifying relatives, but those persons must live with your fiancée for the ENTIRE year. Further,she can't claim a non-relative as a dependent if her living arrangement violates local law, in the words of the IRS. In some places, for example, there are still laws making it illegal for an unmarried man and woman to live together. If you and your fiancée 're in such a situation in one of those places, your fiancée can't claim you, you child, bro, mother as her dependents, even if she lived together all year and she provided all financial support.