Let me preface this by saying that I am not telling you this to scare you, but to illustrate the importance of awareness.
My family was robbed at gunpoint in our own home, in broad daylight. My dad had been working in his garage with the garage door open, and went into the house momentarily to use the bathroom. The open garage door without a person in sight apparently presented a moment of opportunity for the 2 men who robbed us. They pulled into the driveway and probably intended to quickly grab somethings from the garage and run, but my dad walked out as they pulled in the driveway. One man got out, and asked my dad for directions. My dad sensed something was not right, and as he was providing directions, he was walking to where he kept his gun. At that moment, the man placed a sawed off shotgun to my dad's head, walked him into the house where my mom was cooking, took them at gunpoint through the house and took all small valuables he could find (i.e. cash, jewelry, etc.)
In our situation, no lock, alarm system, etc. would have prevented this from happening. We have a dog, who had gone with my aunt for the day (our dog "vacations" at my aunt's house - a whole different story - lol), but the robber saw the dog bowls and said if a dog comes after him, he'd shoot it.
And if my dad had made it to his gun, someone would have undoubtedly been shot that day, maybe killed. With no real way to defend themselves, my parents gave the guy anything he asked for, hoping he'd get enough and leave peacefully. Thankfully, that was the case.
My son and I were napping in the apartment that is connected to the back side of my dad's garage. I heard the rukus in the garage, but it is common for there to be noise in there, my dad does a lot of work and projects in his garage, and his friends stop by regularly. Thank God, they left without realizing the apartment was there, or I feel sure they would have come to my apartment also. The first I knew of what was going on was when my mom busted in screaming to get the baby and get out - that we'd been robbed at gunpoint.
Needless to say, this experience changed our worlds forever. It changed the way we think about our security. We learned that awareness and prevention were the only things that could have possibly changed the course of events that day. As a result of this awful experience, we have installed security cameras with a tv monitor in the house, so that we can see any cars pulling into our small street or driveway, as well as anyone who is at any of our entrance doors. We installed a gate across the top of our driveway to deter anyone who is not invited from pulling in. Will the gate stop someone from getting in who wants to? No, you simply have to get out of your car and open it, but it discourages anything like turn-arounds, etc. We placed a NO TRESSPASSING - DO NOT ENTER sign at the entrance of our dead end street. Of course, this had to be agreed upon by our only neighbor, but after our incident, everyone was on the same page about safety. On that same note, we are now more keenly aware of our neighbor, and he is of us and what is going on at the other's property. And if anyone is going to be alone in the residence for any significant length of time (i.e. overnight), we alert the neighbor for just a little added sense of security. We have thought and planned in detail what we would do in the event of a break-in. Where we would hide, or how we'd escape and where we'd run. We installed more outdoor lights, again, just as a deterrent. And we learned to call 911 at even the slightest twinge that something is amiss.
I know, it's all very scary. But in reality, the only thing that might have helped us in our exact scenario, would have been preparedness. Even that might not have changed things on that day, but locks, alarms, dogs, etc. would have done nothing.
We have changed our awareness level. When outside, we become keenly aware of a car passing by more slowly than typical. If an unfamiliar or suspicious car stops by our drive, we are proactive and not afraid to call 911. We don't answer the door - we don't even go to the door - if we can't see and recognize who is knocking. Those kinds of things.
I would just suggest to you that to "up" your security factor, you keep these kinds of things in mind. I am all for installing bigger locks, and getting some ferocious dogs, but just be aware that they may not be enough. Have a plan. Discuss it in detail with your family, if they are old enough to understand but not be too frightened. If they are little, plan for what you'd have to do if you needed to hide or escape from your house.
Best wishes to you. This is a tough issue for me.