As I said last week, I will iterate over my wife's known ancestors, in numerical order, and list for each ancestor what I know, what I can find online, and what I should do next.
I have done that for the first three people in the tree, but for privacy reasons I will not publish the result here.
Numbers 4 and 5 are my wife's paternal grandparents, Norberto Duroy and Venturada Astoriano. My father-in-law told me they were born in San Isidro, in the province Northern Samar (Samar, at the time - Northern Samar is a separate province since the 1960s). Norberto also died in San Isidro, his wife in Santo Tomas, province Davao del Norte. Unfortunately my father-in-law passed away before I could ask him any further questions. My wife knows nothing about her paternal grandparents, presumably they died before she was born, or possibly during her infancy.
Norberto and Venturada had (at least) three children. My father-in-law, born in 1939, was the youngest. That means Norberto Duroy and Venturada Astoriano probably married in the 1920s or early 1930s, and they were probably born between 1900 and 1915.
I searched Google, Family search, and the new record search pilot without result.
So what's next? The first thing I should do is talk to my mother-in-law. She will certainly know if her parents-in-law were still alive at the time of her marriage, and hopefully a bit more. I should also try to find the children of Norberto Duroy and Venturada Astoriano that are still alive, if any. And I want to go to San Isidro to see if there is a grave.
Records I should order from the FHL include the civil registration of San Isidro and death certificates from Northern Samar and its predecessor Samar. They can only contain the death certificate of Norberto Duroy, though, as his wife probably died elsewhere and records from the time of their marriage are not available. Available censuses are probably too old, though they will be useful for the next generation.
Finally, I should find out if there are any church records left from San Isidro, and where they are kept. This seems essential as it is probably the only way to move back a generation.