Extraneous means "irrelevant or unrelated to the subject being dealt with."
Hybrid means "a thing made by combining different elements."
Concomitant means "naturally accompanying or associated with."
Extraneous is the word that fits. Concomitant is actually the opposite of this.
It is false that the Gibbs family owns the blanket factory. It is Mr. Cartwright who owns the blanket factory.
I'd say the fact that the characters are talking animals is a pretty good indicator that this story was made for children.
