what does it mean when the will says tomorrow it’s ashes will be scattered to the four winds

That will be the burial of sorts for Samuel Westing. One of the clues suggests that the person who knows which way the wind blows will be successful.

i think it means that tomorrow will be the day that either he gets buried or cremated, because when you die, if you get cremated it means your body is burned and somebody can keep the ashes. in this case that is what it means, that he will get buried because he is dead.