What's your take on this - If the father has been irresponsible (no sustento at all), does he still have the right to see his child?

Do not know what should be the ideal answer but personally I would not allow such father to meet the child if he had been irresponsible. But, yes, being irresponsible is a wider term. Because irresponsibility can start from a very little thing to a larger one. So, I would most likely forgive him for little things but if I find the temperament of the father is irresponsible as a whole then I would not allow him to see the child.