Augusto Piaggi Family

My paternal grandfather was George Piaggi born n Sydney c. 1880 to parents Augusto and Maria. who were originally from Pisa, as far as we know!!I think Augusto's father was Carlo Piaggi who remained in Pisa. I will appreciate any leads. Some questions I have are... Maria's family? did Augusto have siblings? where? George had siblings but I know nothing about them. Augusto arrived originally in Queensland with wife Letizia? What happened to them. He is registered as marrying Maria in Pisa and returning to NSW. I am only beginning this journey and don't know if I'm up to it.