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So my sister , her bf and kids moved in with my mom , where we also live with our 3 kids . We both filed head of household.  We have separate rooms , we dont share groceries, they have there own phone bill they pay,  we pay my mom 300 a month for our phone bill , but it's in her name name,  Same for utilities.  All in her name , but we split them 3 ways . Will we get audited ?