[Frank Ettin]

Originally Posted by TheGoldenState

...an intruder breaks in, BUT does not come towards me, rather begins to run upstairs (away from and with back to me) AND I have family member(s) upstairs ...

See Penal Code 197 as quoted by Bartholomew Roberts (emphasis added):

Homicide is also justifiable when committed by any person in any of the following cases:

1. When resisting any attempt to murder any person, or to commit a felony, or to do some great bodily injury upon any person; or,

2. When committed in defense of habitation, property, or person, against one who manifestly intends or endeavors, by violence or surprise, to commit a felony, or against one who manifestly intends and endeavors, in a violent, riotous or tumultuous manner, to enter the habitation of another for the purpose of offering violence to any person therein;