or if they were aware Hm, maybe they were too scared too move or say anything.
but with one twin still having his thumb in his mouth i think its unlikely.
I see no way those kids slept through the masacre as described.
Now if a silencer was involved... but then that becomes a bit more inconvenient 
Bob, are you aware how little noise a .22 makes, with, or without a silencer.
it does not make a noise like a twelve bore, in fact a .22 is reletivly quiet.
Not really Cliff, but if they're that quiet why do people use silencers on them?
Okay Bob, I understand that a lot of folk do not know how much noise these guns make.
A silencer is normally fitted, so when you have a shot at a rabbit for instance it will not spook the other rabbits around it.
I have been out with my son, and he has shot a rabbit, and the others just sit there, as they did not hear the shot.
Different things can also come into play, for instance the wind direction.
There are many variables