News about Quagliaroli's root - part 1:
Pietro Giuseppe Q had Simone Q (1778 Piacenza, I have already written about him), Lorenzo Q (1781, Rompeggio)
and Margherita Agata Luigia Q (1791, Retorto).
He married Teresa Boscani (more probably Toscani, Boscani seems a mispelled) the 9 november 1773 in Piacenza city.
After, in february 1823 in Retorto he married Maria Domenica Agostina Denegri, born in Milan and it seems he hadn't other children.
The banns of the 2nd marriage are 30 jan 1823.
Maria Domenica Agostina De Negri (1776 Milan) was the daughter of Giovanni Denegri (abt. 1750 Milan) and unknown.
Before married Giuseppe Pietro Q, she lived in Rocca of Ferriere and was married with Francesco Taravella
(they married probably in Milan the 4 july 1814).
Francesco Taravella born about 1773 at Ferriere and died about 1822 in Rocca of Ferriere.
Margherita Agata Luigia (also Margaritta Agata Luigia) was born in Retorto in 1791. She married Giacomo Michele Gagni of Retorto
the 2 oct 1814 in Retorto. The banns marriage were in Piacenza city the 15 june 1814.
Giacomo Michele Gagni was born in Retorto too in 1788. His parents were Giovan Maria Gagni (abt. 1758 Retorto) and
Maddalena Francesconi (abt. 1765 Retorto).
Lorenzo Q was born in 1781 at Rompeggio and in 1806 he married Maria ??? born in Rompeggio at about 1785.
They had Teresa Quagliaroli, born the 5 june 1808 in Rompeggio.
I hope these info are usefull for someone, they are online thanks to Anthony Barbieri.