Okay so I figured that out and I will add the son and daughter these questions are for are Cornell students so perhaps that a bias there too.
And it's fine if they are subject to the medicare taxes etc, (they are exempt for their university jobs) because if I use 1h (which of course the list in the instructions is quite limited and non refer to internships or anything close), then then still owe nothing because the standard deduction goes up significantly based on total income and zeroes out. Thanks for the engagement. I will figure this out sooner or later.
