Entangled Ring

On the eve of the old man's death, his children were all looking for a rare ring that the old man had obtained in his early years. A small ring seduced everyone's greed and desire. From then on, strange things happened frequently... Why did the old man refuse to talk to his children about the ring until his death? Why did he leave those strange last words before his death? What is the third uncle who is the only one who knows the inside story hiding? What disaster did that ring bring to the family back then?