How close is your family? How involved are you in each other's lives? What about your family's temperament? Are you the kind of family where everyone is relaxed, with an open-door policy, or are things a bit scattered and you like it that way? Or do you prefer order, everything kept tidy and in its place, favoring people to call before dropping by? This is the structure of your family.
Some families are so involved in one another's lives that there is little privacy. They know the ins and outs of each other's business. When a problem occurs, everyone gathers, and there are few secrets. Your culture may define the amount of closeness you have.
For many cultures, it is normal to be extremely caught up in one another's lives. This can be a great support system. It can also be unhealthy, if one or more persons feel they need more space to differentiate and be an individual. If even one person feels it is negative, it can be called enmeshment. But if all family members are content and enjoy the closeness, you may just have a close-knit family.