Most homicides (3/4) happen between people who are intimate, family, friends, or acquaintances, only about 1/4 are committed by strangers.
Among all homicides, most involves firearms as the murder weapon.
Having a gun at home significantly increase the chance of homicides within the families (not about accidents, that is small as your references says, we are talking about the deliberate killing of other members of the family over romantic relationships, quarrels, etc.)

There are also many references about increased suicide rate in families who own guns.