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@HOPE2 wrote:

Since I am confused for part IV, I expressed this question.  In this part,  I have two understanding: 1- self-employers can take 60 days for him/herself or 60 days for son or daughter!  If I am correct it means self-employer can take 80 days for himself. Is it true?

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Have you looked the Instructions for line 59?  It makes it a bit clearer.

Enter the number of days in the period from April 1, 2021, through September 30, 2021, that you were unable to perform services as an eligible self-employed individual because of certain coronavirus-related care you provided to a son or daughter whose school or place of care is closed or whose childcare provider is unavailable for reasons related to COVID-19 or for any reason you may claim sick leave equivalent credits.

https://www.irs.gov/instructions/i7202#en_US_2021_publink100085617