One of my friends own a family business and i’ts a beauty salon
It became so successful because her and her family work together so well they get along and understand each other , they all want the business to grow and to work well first she put her family in wok based on their skills for example her sister is great at doing makeup so she let her take the job and she always has a new ways of attracting customers with offers and discounts that way it became more popular and busier also her customers are loyal to her because they trust her work ethic.
Finally I think in order to have a successful family business you need to work hard together and make the best you can.