How to convince my parents to buy a cheap but profitable business in need teling them mouth to mouth?
Answers:
Do your homework.. and create the presentation.
If you own done your research thoroughly, it wont event whether it come from you, or the muckety-muck down the street. You will know how to answer and promise near objection that may arise.
In certainty, you would be the BEST entity to present it, as you already enjoy an far-reaching arrow surrounded by your quiver... TRUST.
Bring it to them as warning you are seeking. hold yourself as a third participant, influence its a friend specifically doing this and they have need of suggestion.