The monkey, being a manipulative and opportunistic creature, then shifted its focus to Stewie, believing him to be a more susceptible target due to his age and perceived powerlessness. It tried to influence Stewie's actions to achieve its own goals, but eventually failed due to Stewie's intelligence and Brian's intervention.
Chris was not involved in the monkey's schemes at all. While he might have been a potential target, he was not seen as a significant threat or valuable ally to the monkey.