The kids ruin their lives, so they must put Mum firmly back in her place for their own comfort and safety. At Mum's house, they can pretend they aren't jerks who've made a mess of things. Mum paints over their flaws with undeserved tributes on her birthday. They love it.
The veteran cop can't not trust sweet Mary's face when she tells him the complete truth: "I did everything I could." Meaning she tried her best to murder Mark before the ambulance showed.
The kids may have saved their mother's life, but there's an equal chance all they've done is shrunk it down to nothing. While the family enjoy that dark celebratory lunch, Mark opens his eyes. Whether he lives or not, it's just to remind us that chaos won't be kept down.
The veteran cop can't not trust sweet Mary's face when she tells him the complete truth: "I did everything I could." Meaning she tried her best to murder Mark before the ambulance showed.
The kids may have saved their mother's life, but there's an equal chance all they've done is shrunk it down to nothing. While the family enjoy that dark celebratory lunch, Mark opens his eyes. Whether he lives or not, it's just to remind us that chaos won't be kept down.