It is always a good idea to look to home security in the context of an overall systemic solution, but I respectfully submit that nothing will ensure that the family is "completely" protected.
Completely???? Hard to say, very well protected, yes. I am more concerned for their safety outside of the home than at home. For that I have a firearm that goes with me all the time.
Let me relate a little story for you. My dad's brother during WWII served in the Air Force and was a Commandant of a US prisoner of war camp in the southwest. Not one time did he ever carry a pistol or rifle during that time inside or outside the camp. Not once was his orders to the prisoners ever questioned. He did carry a 150 lbs very well trained German Shepard that went everywhere with him. We had two German Shepard's but had to get rid of one of them, he was my wife's favorite, but I was the only one that could get near my wife without him attacking. On an occasion her brother went to give her a hug goodby and was promptly bite in the butt without warning. My wife still misses him. But:
When we adopted our daughter (4 years ago), Henry had to go just for safety's sake. I still have my Shepard but my wife has her Pekineses who is an utter terror and sets off our Shepard into attack mode every time someone comes by.
Both are great dogs with the children, but I would hate to be a stranger braking into our house.
Stay safe and shoot straight.
Jim