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You must submit a separate Form I-130 for each child if: The relative you are applying for is your spouse; Together you have biological children, stepchildren, or adopted children, and. You did not file separate petitions for them.

 

https://www.uscis.gov/i-130#:~:text=You%20must%20submit%20a%20separate,file%20separate%20petitions%20for%20them.