Final answer:
The provided text does not contain information about Henry's mother's reaction to Keiko being his best friend, instead, it discusses a character named Kismine who is emotionally distressed.
Step-by-step explanation:
To answer your question regarding Henry's mother's reaction to him saying Keiko is his best friend, the provided text does not contain the necessary information to give an accurate response. The excerpt you've shared speaks of a character named Kismine who begins to weep, mentioning her attachment to some people and her confusion about her sister Jasmine's actions. This passage suggests a storyline where emotional complexities and dark suspicions develop but does not directly relate to Henry, Keiko, or the reactions of Henry's mother.