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If you don't answer the door they may assume no one home and procede with a break in. I keep a gun in the office desk next to the front door and have it in my hand behind my back when answering the door with foot forward to block the door and body bladed. There are other guns (same model) concealed at the rear of the house and in the bedroom for surprise vistors. Other guns are locked in safe. Luckly do not have childern to be concerned about as they are all grown and on their own.
Extended family have a doorbell code. I also keep my truck in the drive to advertise the house is occupied so there is little danger of them thinking the house is empty.

Not answering makes them think no one is at home and can encouage a break in. suggest putting in a intercom and maybe a CCTV at the door. Also have heard of a incident where they will try distracting you at the front door while a confederate will storm the back door.
If the gun is not on you its too far away.