how can i get them 2 understand bitcoins?
Depending on what sources they trust, this may be useful:
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http://www.economist.com/node/21518611 The Economist article on Bitcoin
You could try this angle: You have an interest in currency trading and there is only one market where you can participate with $10 or less a week, and that is bitcoin. If you simply break even you are doing better than most everyone else and that would indicate perhaps that you might have a future in the financial industry.
im trying to make money off bitcoins bcuz my parents only give me $10/wk.
Do you have anything that you would be willing to sell in exchange for bitcoins? it costs nothing but your time to list on BiddingPond.com for example.