If children are not your children he has the right to claim them. However, he would not be entitled to file as head of household if you are paying more than 50% of the cost of the home. If you have lived together all year, (January 1-December 31, 2017) he could choose to let you claim one of his children as a qualifying relative, if you are not related by blood or marriage.
The purchase of a car can provide a deduction of the sales tax paid if you can itemize deductions instead of using the standard deduction. The standard deductions for 2017 are included here for you.
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The standard deduction for single taxpayers and married couples filing separately is $6,350 in 2017, up from $6,300 in 2016; for married couples filing jointly, the standard deduction is $12,700, up $100 from the prior year; and for heads of households, the standard deduction is $9,350 for 2017, up from $9,300.
You must have a qualifying child or relative to use the head of household status on your tax return.
The head of household status can lead to a lower taxable income and greater potential refund than the single filing status, but to qualify, you must meet certain criteria. To file as head of household, you must:
- Pay for more than half of the household expenses
- Be considered unmarried for the tax year, and
- You must have a qualifying child or dependent.
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TurboTax
Guide to filing Head of Household (click this link to review more details)
https://ttlc.intuit.com/replies/4791157
