It is not at all clear what you are trying to do. Your son and daughter cannot file tax returns for 2020 until next year in 2021, so why are they in need of something from you at this time? If they worked for you during 2020 then in early 2021 you issue each of them a 1099Misc so they can use it on their 2020 tax return.
And not sure what you mean by your statement that you are going to file at "the end of the year. " The filing deadline for 2019 returns was July 15, unless you got an extension--in which case your deadline is October 15, 2020.
Please explain in more detail what you are trying to accomplish.
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