Everything has a cause and an effect.
When he was young, he acted willfully and abused his biological daughter, causing her to fall ill and die tragically; when he was old, his children turned against him and he fell into an isolated and helpless predicament.
The sons and daughters do this just to pull out the thorn that has been stuck in their hearts for thirty years!
And Cherry, the protagonist in the article, never figured out why he ended up like this until his death!