Form 8814, is it an option?

He doesn't meet the 8814 criteria.

8814 requirements-

Use this form if you elect to report your child’s income on your return. 

If you do, your child will not have to file a return. You can make this election if your child meets all of the following conditions. 

• The child was under age 19 (or under age 24 if a full-time student) at the end of 2021. “Student” is defined below. 

• The child’s only income was from interest and dividends, including capital gain distributions and Alaska Permanent Fund dividends. 

• The child’s gross income for 2021 was less than $11,000. 

• The child is required to file a 2021 return. 

• The child does not file a joint return for 2021. 

• There were no estimated tax payments for the child for 2021 (including any overpayment of tax from his or her 2020 return applied to 2021 estimated tax). 

• There was no federal income tax withheld from the child’s income.

IRS source for the above