Make a map of your house using the link provided here or use your own paper.
Identify all rooms in the house or apartment and have a way(s) to escape from each room located using windows or doors.
Doors are always the easiest way out if they are available.
All occupants that are old enough should know how to operate locks on doors and windows.
Discuss with family who will be responsible for younger children, disabled persons or the elderly.
Pick a meeting place outside your residence where everyone will gather after they have left the building.