Fiction is in general severely underrated among STEM people today, with many arguing for how it is a waste of time, etc. I was fortunate enough to grow up in an environment where I had good access to it, and a healthy level of support for my interest.
THe thing I find funny about this is that many of the "STEM legends" such as von Neumann, Ulam, Einstein and others had read a lot of classical literature. Einstein himself is quoted saying: "Dostoevsky gives me more than any scientist, more than Gauss." I just make sure I give this quote only when there are no number theorists in the room.
Sure, if one just confines oneself to the "popular" works on a standard YA list, it may be reasonable to conclude that some fiction is not worth reading for a STEM person. However, the classics are classics for a reason after all.
Moreover, it is also not implausible that a discerning eye can find plenty of great worth in modern authors as well, something the parent has done.