Hi (and thanks for playing) - the problem you are facing, happens when you arrive at the home before using the cell phone to call your wife first.
In this case, the only way to progress further, is to have recovered the shotgun shells from the gun store (and retained them) and then to make a sawed-off shotgun at the neighbor's house before going upstairs to find your wife.
If you do not have shotgun shells at this point, then you are (unfortunately) SOL. If this is the case, the only thing to do is to restart and make sure that you either call your wife or get the shotgun shells before arriving home (or don't go home so fast, as the convict will die on his own if you wait long enough)...
Good luck!