Phạm Phật
Fan Fo  was the king of Champa from 349 to 380, and the son of Fan Wen.
In 353, the King was defeated by the Jin governor of Jiaozhi.
The governor also recaptured Rinan, which had been captured by Fan Fo's predecessor, Fan Wen.
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Bhadravarman I
Bhadravarman or Phạm Hồ Đạt (Sanskrit "Bhadravarman", literally "Blessed armour" but also meaning the "Jasminum sambac" flower), was the king of Champa from 380 to 413.
In 380, Bhadravarman, the son or grandson of Fan Fo, took the throne with the regal name Dharmamahārāja Śrī Bhadravarman I, "Great King of the Law Bhadravarman".
He is the first Champa king to have "varman" suffixed to his name.
The use of the honorific title "varman", very common amongst the Pallava dynasty kings, was borrowed by the kings of Cambodia.
Also the same year, the King moved the capital to Indrapura in Quảng Nam Province.
He built temples and palaces, all facing north, at Mỹ Sơn and Trà Kiệu.
Significantly, Bhadravarman was a renowned scholar, well-versed in all four Vedas and the author of several inscriptions in Sanskrit.
He invited learned Brahmins from India to settle in his kingdom.
In 399, Bhadravarman went on a military campaign up north and succeeded in capturing the Vietnamese provinces of Rinan and Jiuzhen .
He continued on his temple-building campaign as well, building Cham towers along the coast up north.
From 405 to 413, he continuously battled the Chinese governor
Do Tue.
However, at their last confrontation, Bhadravarman disappeared without a trace after he was defeated by the governor.
Two of his sons, Chen Chen and Na Neng were killed in 413, while another son, Ti Kai, fled with his mother.
Bhadravarman's son, Ti Chen, Gangaraja, abdicated the throne and left for India.
The kingdom then transitioned into civil war.
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Question: Who is Bhadravarman I's paternal grandfather?
Answer: Fan Wen