When you are dealing with family in the course of your workday, it is important to schedule your activities as much as possible. With small children, you must take time when you need to, but you should also work hard to make sure you dedicate a specific
number of hours to your workday.
With older children, it is much easier to tell them that you will be working between the hours of x and y. Then your children, and even your friends, must understand that certain hours of your day are devoted to the activities of your business.