Question: Who is John Ii Casimir Vasa's paternal grandfather?
Sentence (from "Sigismund III Vasa"): Sigismund III Vasa (20 June 1566 – 30 April 1632
), also known as Sigismund III of Poland, was King of Poland, Grand Duke of Lithuania and monarch of the united Polish–Lithuanian Commonwealth from 1587 to 1632 as well as King of Sweden and Grand Duke of Finland from 1592 until his deposition in 1599.
Relevant evidence: No