Regarding the kiddie tax, the way I read the IRS website is that the example given is for a singular child. To me this means the tests apply to each child individually. If each child, individually, meets all of the criteria listed, each of your children's income can be reported on your return. Read carefully and consult a tax professional if questions remain. I am not a tax professional.
From IRS.gov:
Parents' Election to Report Child's Interest and Dividends
You may be able to elect to report your child's interest, ordinary dividends, and capital gains distributions on your return. If you make this election, your child won't have to file a tax return. To make this election, attach Form 8814 PDF to your Form 1040 PDF, Form 1040-SR PDF or Form 1040-NR PDF if your child meets all of the following conditions.
At the end of the tax year your child was under age 19 (or under age 24 if a full-time student).
Your child's gross income was less than $11,000 for the tax year.
Your child had income only from interest and dividends (including capital gain distributions and Alaska Permanent Fund dividends).
No estimated tax payments were made for your child for the tax year, and no overpayment from the previous tax year (or from any amended return) was applied to the current tax year under your child's name and social security number.
No federal income tax was withheld from your child's income under the backup withholding rules.
Your child is required to file a return unless you make this election.
Your child doesn't file a joint return for the tax year.
You're the parent qualified to make the election or you file a joint return with your child's other parent.
https://www.irs.gov/taxtopics/tc553
From IRS.gov:
Parents' Election to Report Child's Interest and Dividends
You may be able to elect to report your child's interest, ordinary dividends, and capital gains distributions on your return. If you make this election, your child won't have to file a tax return. To make this election, attach Form 8814 PDF to your Form 1040 PDF, Form 1040-SR PDF or Form 1040-NR PDF if your child meets all of the following conditions.
At the end of the tax year your child was under age 19 (or under age 24 if a full-time student).
Your child's gross income was less than $11,000 for the tax year.
Your child had income only from interest and dividends (including capital gain distributions and Alaska Permanent Fund dividends).
No estimated tax payments were made for your child for the tax year, and no overpayment from the previous tax year (or from any amended return) was applied to the current tax year under your child's name and social security number.
No federal income tax was withheld from your child's income under the backup withholding rules.
Your child is required to file a return unless you make this election.
Your child doesn't file a joint return for the tax year.
You're the parent qualified to make the election or you file a joint return with your child's other parent.
https://www.irs.gov/taxtopics/tc553
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