there is one episode that show when he was bored he had a plan to take over the world, but she ruined it by giving birth to him, oh and he hates the world too

Yeah, I recall that episode but I thought that maybe there was a deeper reason. Thanks

'Stewie's mastery of physics and mechanical engineering are at a science-fictional level. He has constructed advanced fighter-jets, a mind control device, a weather control device, robots, and a time machine. Stewie employs these to cope with the stresses of infant life (such as teething pain, and eating hated broccoli) and to murder his mother Lois, with mixed success at best depending on the objective. In other episodes, Stewie engages in other violent or criminal acts, including carjacking, loan sharking, forgery, and killing off minor characters. In the Star Wars parody episode "Blue Harvest", Peter imagines Stewie in the role of Darth Vader, which would match his darker personality.' Wiki: http://en.wikipedia.org/wiki/Stewie_Griffin 'Stewie and, as soon as he returns home, he begins to plot a diabolical plan to humiliate Lois out of revenge for leaving him behind, which he intends to carry out as soon as Lois returns. Brian scoffs, noting that Stewie has never followed through with any of his diabolical plans before, and is completely skeptical that he will do so this time. Stewie realizes that Brian is right, but swears that this time Lois is a dead woman, so he decides to take immediate action. Lois mere moments before her attempted murder by Stewie Lois mere moments before her attempted murder by Stewie Meanwhile, on the ship, Peter proves to be a continual embarrassment to Lois: he defecates on the poop deck (the name of which he claims is misleading) and tells a story at the captain's table about how they almost aborted Meg. Humiliated, Lois has a falling out with Peter. At this time, Stewie, who has made his way onto the ship via speedboat, finds and confronts Lois. Lois, who had gone outside to mull over her frustration with Peter, is completely astonished to see him, wondering how he came on board without her knowing. To add to her shock, Stewie pulls out a submachine gun and, after a brief moment of tension, opens fire. Lois' chest is graphically riddled with bullets and she falls overboard, her body plunging and sinking deep into the ocean's abyss--Stewie is ecstatic that he has finally killed his mother.' Wiki: http://en.wikipedia.org/wiki/Stewie_Kills_Lois I suppose that he sees her as the main stumbling block in his plan for world domination and as the mother she can exert unwieldy control over his life and for this reason, I surmise that Stewie has it in for her.

I think he just wants to kill her for the heck of it.