Did Pier Giorgio's father ever become Catholic?

Pier Giorgio's father, Alfredo, is often described as agnostic. He was a highly successful, influential man: founder and director of the newspaper La Stampa, Italian Senator and Ambassador to Germany. Despite his lack of faith, he had strong convictions and believed in the values that made a man great such as honesty, a sense of duty, respect for the Church and sensibility for social problems.  He had a great love for his country. In 1922, he received one of the highest orders of knighthood in the kingdom of Italy.

It is a lesser known fact that Alfredo Frassati was actually a cradle Catholic. At some point after Pier Giorgio's death, Alfredo returned to the Sacraments. It cannot be said that he became as ardent in the practice of his faith as was his son; however, no one but God can know what was in the depth of his soul. He died in 1961 at the age of 92 years old.