An interviewee is the person that is being interviewed. In "Inteview with Marielle Tsukamoto, Marielle Tsukamoto is the one who is being interviewed. The interviewer is the one who is asking the questions. 5th-grade students are the ones asking the questions so they are the interviewers.
The entire interview is about Marielle Tsukamoto's experience as a Japanese American during World War II. Most specifically about her time in an internment camp.
