Wobbler on Family Tree Circles

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.

patrick KEEGAN of Ireland married Mary Jarvis in Wellington late 1890's,A daughter Catherine Jane, known as Kathleen married George PIAGGI. One of their sons Russell Stuart married Mary Alice Doran from County Fermanagh, They are my parents and I am looking for any KEEGAN relations.