Question: What is the date of death of Sirindhorn's father?
Sentence (from "Sirindhorn"): Princess Maha Chakri Sirindhorn, the Princess Debaratanarajasuda (born 2 April 1955), formerly Princess Sirindhorn Debaratanasuda Kitivadhanadulsobhak , is the second daughter of King Bhumibol Adulyadej.
Relevant evidence: Yes