Where are ya'll from, since it is different from Country to Country and in the states its different from State to State.
To be considered a "Business" you have have some sort of viewing by the state. You can be a DBA "Doing Business As" LLC, LP, Inc. You do have to file your taxes which I don't undestand by the kids. Basically they are just taking money and not paying any taxes. When ever I have someone do work for me I send them a 1099 Form which stats that I did pay them and they have to pay the tax on it. Some people say its "BS" I do that but I run a business and tell them to get real. I have A LLC in Rhode Island, Kansas, and in Kansas for multipul things
Hope this helps out a little
Frank