Chinese father, Filipino mother, both Christians. He learned Chinese and Tagalog from them, Spanish from the Dominicans whom he served as altar boy and sacristan. Professional calligrapher and documents transcriptionist. Member of the Confraternity of the Holy Rosary. Married layman, and the father of two sons and a daughter.

Educated by the Jesuits in the Visayas, Pedro could read, write and speak Visayan, Spanish, and Chamorro, paint, draw, sing, and worked as a carpenter. Teenage catechist who worked with Spanish Jesuit missionaries to the violent Chamarros in the Ladrones Islands (modern Marianas) in 1668