surfinguru,
IMHO you have identified your vulnerabilities accurately, and that is the major task on the way to overcoming them.
Working to harden all your home's potential entry points is critical. Adding extra lighting, especially motion controlled lighting, is a great idea. Plantings that discourage access to windows might be a worthwhile consideration. A home security system- either DIY or professionally installed- is another consideration as well. I use a DIY system from
http://www.x10.com/homepage.htm that will simultaneously sound an alarm and auto-dial up to four telephone numbers to deliver a pre-recorded message if triggered, and am satisfied that it does a reasonably good job.
Even if the end of your house where the sliding glass door is has a fence around it, IMHO you need an extra 'layer' of security at that end of the house. Maybe locking steel burglar bars over the slider, and a key to same in a place where your child has easy access in the event of an emergency where evacuation is necessary would do it. Maybe a tall privacy fence, I don't know. But I'd consider something like that as a primary early step in hardening the perimeter of the house.
As you indicate, you don't have a lot of interior room, so trading interior space for time isn't much of an option in your case. What you need to to is make sure that you are aware any time anyone comes into an area where they shouldn't be. You can do this with video equipment, and you can do it (cheaper) with audio devices. We use the system shown at
http://www.buy.com/prod/reporter-rwa300r-the-reporter-wireless-alert-system/q/loc/111/90125222.html (now known as The Chamberlain), with three exra sensors, to monitor the area inside the fence around the house. A second system, with three extra sensors, monitors the area around our property (we have two layers of fencing around the house- a perimeter fence around the property and a fence around the house itself). Extra sensors- the system will handle up to four, total- are listed at
http://www.buy.com/prod/Reporter_PI...15/Category/Electronics/loc/111/90125215.html .
We've found the system quite reliable, though it can alert to birds, insects right in front of the sensor eye, wind-blown vegetation in the sunshine, deer etc. Sensors have a detection range of about 30 feet and a wireless transmission range to the receiver of about 300 yards, depending on intervening obstacles. Each sensor transmits a different number of beeps, so you can tell which sensor is going off.
I am of the "use enough dog" school of home defense. You might well not want Brazilian Mastiffs like ours, but a family dog- if you can manage it- would IMHO be a first rate idea. And likely superior to any electronics, as well- not to mention being a lot more companionable. Having a dog in the house is a good way to get advance warning of anyone snooping where they shouldn't, and one more way to trade space for time- by extending your protected space outside the house itself.
IMHO, Job One in any potential home defense scenaro is to get every person in the household secure and under cover. in your case it sounds as if it would be better to set up your safe area in your son's room, and have the adults move to him and then stay there.
Your safe area should provide, at minimum:
1) Cover. Furniture, beds/mattresses, bookshelves, whatever you want to arrange, however you want to arrange it, that will let youu, your wife and son 'fort up' while protected from incoming fire from any direction. A 'frendly wall' (no doors or windows) should be behind you.
2) Control, or Field(s) of fire. While behind cover, you should be able to maintain control of every access to the room you are in with the firearm you have.
3) Communications. You need both a landline and a cell phone in your safe area. The cell phone need not have a current subscription, any working cell phone that can reach a tower can dial 9-1-1.
I had suggested several resources to you earlier with information that will help you formulate a good plan for defending your home. To reiterate, I suggest you take the NRA Personal Protection In The Home class. See
http://www.nrahq.org/education/training/basictraining.asp for a locator that will let you know if anyone is teaching the class near you.
Failing that, the class is available on DVD at
http://materials.nrahq.org/go/product.aspx?productid=ES 26840 , and the textbook is at
http://www.nrastore.com/nra/Product.aspx?productid=PB+01781 . In addition, I like Louis Awerbuck's
Safe At Home video also- it's available at
http://www.paladin-press.com/product/129/73 .
Developing a good home defense plan (along with effective plans for other emergencies), hardening your home's perimeter, gaining control of the space immediately around your home- all should help you secure your family against unpleasant surprises.
Best wishes,
lpl/nc