Talk:Monster Kid/@comment-67.242.9.110-20151009231941/@comment-1511610-20151013215422

Just because Alphys might be older doesn't discount her from being Monster Kid's sister. Monster Kid could just be her baby brother/sister.

Monster Kid being related to Alphys might also contribute to why Undyne tries to make sure Monster Kid is safe (such as in the moment prior to the Undyne fight in a Genocide run, or warning Monster Kid to stay away from you on any route).