the older brother.. (spoilers)
when i saw the end i generally assumed that the older kid (the last one to die) was Quims son. anyone else agree or think why this is not the case?
further reasoning was Quim asking Maria, several times about family and kids. him stating his situation with his ex was 'complex' and he was on his way to see her. finally the dog ran up to Quim at the end and started being very friendly as a dog might behave when seeing an old master.