Found a few things on a quick search:
- Ancestry has an obit for an Evelyn Prahlow Lipscomb, daughter of Charles and Dorothy, who died in 2001
- A search on the Italian Genealogy Group NYC death index shows a Howard Prahlow, age 3, who died in the Bronx in 1908
- Charles and Dorothy appear in the 1910 census in the Bronx, with 4 of 5 children living.
Ordering the certificate might give you clues about Charles' hometown. Good luck!