I am 52 years old and didn't grow up with my natural birth father. He also wasn't listed on my birth certificate. I did, however, meet him in person when I was 15 and he verbally acknowledged me as his child. I grew up in an extremely dysfunctional lifestyle that meant leaving school before I was 15 years old. My birth father has kept me a secret from his family including a half sibling. Their family unit enjoyed the financial security and result of his hard work with a very stable lifestyle including a 2nd home overseas outside of Australia. I have purposely followed his rules of not contacting him too often and not revealing myself to the family. He now, however, seems to be suffering from memory loss and is denying he knows who I am. Is there a way to force a DNA testing at this late stage, to be able to claim a portion of his estate when the time comes? I have never asked for money or financial support, but now, as time is marching forward and he is approaching his 80's, I feel I need to stop 'wondering' and start asking. Is this even a thing under Family Law?