Cutting grass

Ok so my parents want my boyfriend to cut the grass (the whole entire yard) with the Weed Eater. Because they're too lazy and gamble all the money away to buy a lawnmower or push mower. Well my boyfriend is at work so I want to cut the grass because I'm bored and have nothing else to do. And they refuse to let me do it because they want my boyfriend to do it. And if my boyfriend doesn't cut the grass it won't get done. Because my dad nor mom will. My boyfriend works 12-14 hours a day ALSO I want to cut the grass so he doesn't have to because I know he's tired.  Anyway do you think it's stupid my parents won't let there 18 year old daughter cut grass? 

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