Although this relative of the William Orr who was hung passed through Australia I don't believe he had any children here. He and his wife, Ellen Killeen, didn't have any any children. I have the book by Robert Foy mentioned in this article, but still can't make the connection to my own family.
Yes, I mean the William Orr who had five children at the time of his death, and a sixth born postumously.
Regards
Megan