What proof do I need for custody when obtaining a work permit in ontario?

One of my children does not have a father listed on the birth certificate, and he says that he is not the father and he is 3 and has never meet his father. I am guessing since I am the only parent listed that is all I need. My daughters father and I are divorced and he hasnt seen her since 2001, he didnt even show up in divorce court and I was granted full custody. I am guessing that if I have these papers that is all I need. I am worried though that i will get there to obtain the work permit and they will require something else, I have a job offer and I need to start ASAP. If I go there and they dont give me the permit then can I go back to get it again?

Answer:
a letter from yr boss
  • Should inefficiency in written & oral English prevent a student from earning their high school diploma?
  • If someone were illegal and from haiti, but then she married a US citizen. Would she become legal ?
  • I am a citezen of Afghanistan and would like to get political asylum. Please suggest ways how can I?
  • what is the difference between being a citizen and being a resident?
  • Why don't latinos flush toilet paper?
  • does anyone knows what Guest Worker program is & its laws ?
  • Does the non-violence act of India will improve Indo-Pak relations?
  • Why do mexicans deny who they really are ?
  • I want to apply for immigration in Canada.I am HbsAg positive.Will it prove me ineligible to apply ?
  • Really confused about immigration laws! Please, if somebody can, help me!?