I know of many family businesses in which they are essentially forced to work with their parents due to the nature of their business.  

They have often been bought into the business by their parents and will possibly bring their own children through when the time is right. 

As of yet, I have not come across a business in which the founder has bought their parents in as employees, but this article, highlighting a trend in India, suggests that founders and entrepreneurs would benefit from recruiting their parents into the business. 

The reasons for this being a positive step are many and so this may be a trend that will catch on here in the UK.