"My wife and sister will never recover from their horror. I intreat you not to reason with me any more. Take possession of your tenement and let me fly from this place." (174 Shelley)
in such fear from the sights of the monster, Felix claims that his family will forever be traumatized, and the De Lacey's flee the cottage with no further interest of ever returning again.
"Hideous monster! Let me go. My papa is a syndic- he is M. Frankenstein- he will punish you. You dare not keep me." (179 Shelley) - William
William is screaming out "ugly ogre" and Frankenstein grows more and more angry because everyone he comes across cries out the same exact thing. It has been very hard and hurtful for him. And after William exclaims that he is related to Frankenstein that really sets the Monster off because Victor is the blame for all of his troubles. So the monster kills William out of anger.
"A fiendish rage animated him as he said this; his face was wrinkled into contortions too horrible from human eyes to behold; but presently he calmed himself and continued." (183 Shelley)