Question: What is the date of death of Sirindhorn's father?
Sentence (from "Bhumibol Adulyadej"): "Forbes" estimated Bhumibol's fortune – including property and investments managed by the Crown Property Bureau, a unique body that is neither private nor government-owned (the assets managed by the Bureau were at that time owned by the crown as an institution, not by the monarch as an individual) –
Relevant evidence: No