Being 18 doesn't give you the right to tell your mom no if you're still living under their roof. Until you move out you respect what your parents rules.
English
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If they're being -blam!-ing [url=http://www.wikipedia.org/wiki/Godwin%27s_law]-godwinslaw!-[/url]'s why should he do what they say? As long as he's fulfilling his responsibilities then his mom shouldn't -blam!- him about it.