Question: Who is Prince Karl Anton August Of Schleswig-Holstein-Sonderburg-Beck's paternal grandmother?
Sentence (from "Peter August, Duke of Schleswig-Holstein-Sonderburg-Beck"): He was the fifth and youngest son of Frederick Louis, Duke of Schleswig-Holstein-Sonderburg-Beck and his wife Duchess Louise Charlotte of Schleswig-Holstein-Sonderburg-Augustenburg.
Relevant evidence: Yes