According to the latest report on this story from ABQ Raw Mamachu was "critically injured" rather than simply being in "stable condition" as originally stated. She may very well die too if this is the case given her advanced age and already poor health.
Edit: Added higher quality crime scene images and news articles for the crowd coming in from the feature.
This article was made by someone familiar with the infamy of the family and states Mamachu was critically injured and that the car jacker did this after crashing another vehicle. They really were just at the wrong place at the wrong time.
This article contains a statement from an unnamed Tophiachu confirming my suspicions that Brotherchu was suddenly executed while they slept.
Press conference held by the police this morning.
Scene of crash and death of carjacker.
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Carjacker's original vehicle that he crashed likely while escaping a prior crime that hasn't been linked to him yet, notice flat front tire.
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