Final answer:
Renata and Evelyne are unaccompanied minors on the MS St. Louis in 'Refugee' and are traveling without their parents.
Step-by-step explanation:
Renata and Evelyne are characters mentioned in Chapter 10 of the book Refugee by Alan Gratz, which is a historical fiction novel. Their parents are not present in the chapter because they are unaccompanied minors traveling on the MS St. Louis, a German ocean liner carrying Jewish refugees seeking asylum from Nazi persecution. The absence of their parents highlights the dire situations faced by many children during this period who had to flee for safety without their families.