Ouch. You have my sympathy. Once it gets started it seems to take a bunch of people.
A few years ago, my father died suddenly, he fell down, broke his hip, and died a few days later. It about killed my mother, she was in a downward spiral. Then my older brother, her oldest child, died. That pushed her over the edge. She took another year and a half to die, but only because she didn't have the will to die. She went into assisted living and ate herself to death.
It has to get better.