04.02.1977 female adoptee looking for birthfather and family

Hi, I am 27 yr old female born in king edward memorial, subiaco, perth 4th feb 1977 original name Shannon somethingerother. I have a birth father out there some where who may not know about me although I am told he is listed on my original birth cert. I have done an outreach to my birth mother who has placed both vetoes on herself and has not repsonded to the departments letter that was sent to her in Queensland. My father I'm told was 20 whilst birth mum was 15. They lived in a town south west Western Australia. He was an apprentice mechanic and she still in school. I have a hand written letter to Mr Bryant the solicitor on 19th Feb 1977 who handled the adoption from my birth mother supposedly, although I have my doubts that it was her who wrote it. My grandmother who is also on the affadavit who I am not allowed to know becuase of the vetoes, was originally from Poland. She may still be in WA but I have no idea. Apparently they have a weird Polish surname. LOL which I suppose would make sense. I'd just like to know the rest of my biological family even if my ** doesnt want to know. Thats fine but there are more people involved here than just her. Perhaps her husband might want to know or her children that they have an older sister somewhere. I'd just like to know my biological family, medical history and story from the horses mouth, not the departments version. I dont see whats wrong with that? So if anyone knows anything about this story, feel free to let me know. Cheers Sharon