How do Heather's parents differ in their reactions to Robert's presence in the novel, Wild Robert?

Heather's Dad is the type of individual who has no imagination, and he offers wholly rational explanations on the subject of Robert. He barely notices Robert and is oblivious to the magic spells. Heather's Mum, on the other hand, responds to the spells with nervous bewilderment. She is especially dumbfounded when Robert magically transforms her tour group into sheep who bleat and mill about the Feud Room they came to view