This kind of family breakdown in the wake of a parent's death is one of the oldest stories in the book.
And also, in The Book. The whole Book of Genesis is just one long dysfunctional family disaster after another. As in my case, the feud is over the birthright of a dying parent.
Everyone feels that their position is just, their pain is unique, and the trouble is caused entirely by others with hidden agendas and unprovoked malice. How original. Well, really, how original sin.