Question: Who is William Ii, Prince Of Nassau-Dillenburg's paternal grandfather?
Answer: George Louis, Prince of Nassau-Dillenburg

Fürst) of Nassau-Dillenburg from 1662 until his death. He was the son of George Louis, Prince of Nassau-Dillenburg (1618–1656) and his wife, Anna Augusta (17 December 1612 – 9 June 1673), a daughter of Duke Henry Julius of Brunswick-Wolfenbüttel.