N600K help

[Beep 2]

Iam filling n600k form for my son. I don't fulfill 5 year requirement but my father does. What should I select in Part one, first point. I am a citizen also.Should I fill the form or my father? If I fill it how is the child eligible? On parent basis or grandparent basis? If eligibility  is on grandparents basis , can I fill the form?

[Mike E 11,730]

The form says the parent can apply if the child qualifies based on the grand parent’s physical presence:

 

”Part 4. Information About the Child's Qualifying U.S. Citizen Grandparent

NOTE: Complete this part only if the U.S. citizen parent (or adoptive parent), grandparent, or legal guardian is applying for
citizenship for the child, and the U.S. citizen parent has not been physically present in the United States for five years; two years of
which were after 14 years of age.”