Federal Career Intern Program. It no longer exists, but Pathways is intended to be its replacement.
Is your relative still in school and planning on continuing his education after spending some time at the internship? If that is the case, his position is probably more like those advertised through the Student Career Experience Program (SCEP). I honestly don't know if the Pathways program also replaced SCEP or if it's just intended to provide jobs for those who are looking for a career entry program after they've graduated.
In any case, the vacancy should have listed the details about the position's duration. Since Pathways is new and I don't work for NASA, I can't really provide any insider information. Hopefully there's also an HR person with a phone number listed somewhere on the vacancy announcement that he could contact.