For sole traders and family run businesses, employing members of the family (provided they actually get paid and are active in the business) can help reduce the principals’ tax liabilities.
More care is needed when employing minor children as the payment must be at commercial rates, for duties actually performed, within the National Minimum Wage restrictions and not in breach of any employment legislation. For instance, employing a minor child to help in a restaurant at the weekend at a market rate should be acceptable, whereas working on a building site would not.