Hiring my children

I have self employment business. I want to hire my children and grandchildren into the buiness. All of these children are less than 18, some are less than15.
Where can I learn of the tax rules for this effort?

Start with Hire Your Kids and Trim Your Taxes (http://www.kiplinger.com/columns/ask/archive/2002/q0401.htm) for the basics. And for more info, visit the IRS's small business information (http://www.irs.gov/businesses/small/display/0,,i1%3D2%26i2%3D23%26genericId%3D20005,00.html) Web site.