1. You would be able to use the Head of Household status. You are correct that because it is your grandchild vs. child, the qualifying widow cannot be used.
2. You can continue to use the Head of Household as long as you are supporting your dependents and they are the qualifying child.
3. You can mark zero for now if you are not able to determine how much you will be receiving from the other income, but please be sure to update it as soon as you can determine the amount. You do not want to end up owing at the end of the year.
For Step 3, you can use $4,000 for the children and $500 for other dependents.
I am sorry for your loss, please let us know if you have any other questions!
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