"Substitutes" by Colin P. Davies appeared in Daily Science Fiction on February 1, 2013. "A father tries to save his daughter from alien overseers that spread a disease among earth children, kidnap them for use as interstellar navigators, and replace them with 'substitutes.'"
Mr. Davies knows how to tell a good story, particularly when it comes to building suspense. The ending has a nice, if somewhat predictable, twist. 6 out of 7 rocket-dragons.