There is no law that states you can not put family members on the payroll.If familial expenses were counted as salaries, that would be GREAT! That means that all those salaries would be tax free for me since they are expenses! And for the kids, they would be able to deduct their first $6,200 in income since that is the standard deduction. This is a valuable deduction that most kids do not even get to use currently.
Or just have them as individual corps and sub-contract out to them. Avoid the payroll taxes.