See how often they participate in the script: HERE.
Character Story: Rusl's wife and Colin's mother, Uli is pregnant with her second child throughout the game. She's a caring mother who appreciates Link as a strong influence in Colin's life.
Race Story: Humans typically live peacefully with other races throughout all of Hyrule. The more specific Hylian race is a subcategory of humans. They can be differentiated by their ears -- Humans have rounded ears and Hylians have pointed ears.