It is not only Thais who fight over estates at funerals, although it seems that Thais tend to go for the 'killing' option.
I have not been to a funeral yet in the UK where the family did not argue about what was left to whom.
Families in the UK argue, but they tend not to kill.
My mother, my grandmother, my wife's grandmother, my father-in-law, my son, even my wife - there were arguments about who gets what after they died.
Funerals and 'who gets what' brings out the worst in people.