Police said Melencio Caina, 50, owner of Wells Resort, was stabbed 15 times and shot twice in the forehead, while houseboy Nolito Nazilla had a bullet wound in the head.
Another househelp, Editha Pendre, survived the tragedy when the robbers merely locked her up in the comfort room.
The robbers fled on board a motorcycle toward Morong town, police said.
Communist rebels had reportedly demanded "revolutionary taxes" from Caina. Non Alquitran