In case anyone was wondering, you cannot reduce your taxable income by paying your child to clean your house (I am a former tax lawyer). Could you pay your teenager to work for your company, and reduce the corporate income? Yes, subject to child labor laws — and you still have to pay payroll and income taxes.
Alternatively, you and your spouse can just straight up give your kid $36,000 per year as a gift (with no deduction, but also no income/payroll tax burden).
Having a 7-year-old on the payroll seems like a great way to get audited.