I have four children (two walkers and two non walkers). They all sleep in separate rooms. Back of my house is highest up from ground and front you could climb from window to ground no problem. My evacuation is to go from back to front, getting all children out of bed. My son is 3 and he knows to go outside (front door or side door) as soon as I say. If playing inside, he is to take little one who can walk and hold her hand to guide her out of house in front of me while I carry other two.
The scary part about it, is depending on the emergency, you may need to alter your plan.