Depends on the context. I value my family considerably over possessions. Between my dog, a heavy object, and some basic self defence training, I should be fine to protect them.

It's worth noting that almost no criminals doing home robberies are armed with guns. Most don't even carry knives. It significantly racks up the charges, if caught. Also, our police, while lack luster for most break ins, won't be for an armed, aggressive robbery. I've seen their response for a simple gun sighting (it involved helicopters etc).

In summary, and order.

1. Nothing, since they likely target an empty house. (I also have home insurance)

2. Scare them off. They want a confrontation even less than I do.

3. Bug out. Then involve the police.

4. Roll the dice on a physical confrontation. I'd likely do better with a lump of wood, or a knife, than a gun, at least a close range.

I'm not looking to play hero. Things can be replaced, my life, family, and body can't be.