There are a number of ways of supporting a child financially. I received a lump sum each month that in no way paid for what I figured was half of their 'upkeep'. My sister-in-law's support worked in such fashion as she submitted reciepts to her ex's lawyer each month - including rent - and the father had to reimburse her for half. Meanwhile, when I was with my second spouse he had to pay support in addition to the mortgage of his ex - and he had equal custody. And then my brother has to pay his ex alimony despite him having custody of the four children. I don't understand why there can be such a variance in the same province. It seems entirely to do with how good one's lawyer is.