Question: Who is Prince Michel Of Bourbon-Parma's paternal grandmother?
Sentence (from "Prince Sixtus of Bourbon-Parma"): Prince Sixtus of Bourbon-Parma (1 August 1886 – 14 March 1934) was a member of the House of Bourbon-Parma, a Belgian officer in World War I, and the central figure in the Sixtus Affair, an attempt to negotiate a treaty to end Austria-Hungary's participation in the Great War separate from its Central Powers allies.
Relevant evidence: No