Input your data into the program to see exactly what your refund will be
You have not mentioned if the income was income from working. Only income from working is used to calculate the child-related credits.
https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit/use-the-eitc-assistant
Your income is under the standard deduction amount for a single or head of household filer, so at a minimum you would get a federal income tax refund equal to the federal tax withheld as reported in box 2 of your W-2 form. In addition, you may qualify for an additional child tax credit of up to $1,600 per child dependent listed on your tax return. You would only be able to list your children as dependents on your tax return if you provided over one half of their support for the year and they lived with you, unless they lived with their other parent and that parent gave you permission to claim them as your dependent. You may also qualify for an earned income credit. As mentioned by @Bsch4477 you would have to complete your tax return to see what your refund is.