Throughout his life, Pier Giorgio and his sister were close friends. Outside of the home, he developed a wide network of friends where he found great consolation to balance the tensions of family life. He summed it up best in a letter to his best friend Marco Beltramo:
"In this earthly life after the affection for parents and sisters, one of the most beautiful affections is that of friendship; and every day I ought to thank God because he has given me men and lady friends of such goodness who form for me a precious guide for my whole life."