[throwaway1909]

Don't feel guilty about this, or as if you and your brothers should have done something differently. It wasn't your choice to make-- it was hers and your parents'. They may have understood her condition and wishes differently, and had conversations you weren't a part of. In the moment, you guys didn't challenge the hard decisions your parents were making, and instead showed support. Which is doing something in its own right. Moreover, morphine can give a pleasant high, and combined with patient's own adrenaline surge around the times they're the sickest-- can make very sick people look much better. Consciousness/lucidity waxes and wanes a lot in sick people.