19 year old child, dependent & HS student with W2 income under $5K. Required to file taxes?

I am uncertain if child should file taxes or not. Had a couple of W2 jobs and earnings were a bit shy of $5K. Child was in last year of high school in 2024 and was a dependent in the household.

 

Does child need to file taxes? Do I add child's income to my taxes? 

 

Bonus question: 23-yo, full-time student, dependent with no income for the year received a 1099-INT for $22. Do I report it somewhere?

 

Thank you!!!