Very strong documentary but i wouldn't blame any of the players, each did what had to be done. Those were very rough times back then, and as Kukoc said, whether you liked it or not, you had to chose sides, and nobody picked against his family. I feel bad for what happened between them but i kinda understand both sides.
LE: to understand better what that war was like, i recommend watching Harrison's Flowers. It's not a documentary but it shows you a very powerful image of the war between the serbs and the croats from a photojournalist's eye.