but unfortunately your father lives offshore so you are not eligible according to the requirements of the visa:
Do not apply for this visa if:
you or your partner have any near relatives, who are usually living outside Australia, or are only living in Australia on a temporary visa, Bridging visa or unlawfully.
Your case is a bit tricky since your father left you years ago. I reckon you simply tell the truth to co. Try to find evidences that proves '我们和生父34年没有联系了'. that he is sort of 'dead' to you. well again it's all up to the co. good luck.