Question: Who is the mother-in-law of Johannetta Of Sayn-Wittgenstein (1632–1701)?
Sentence (from "Gustav, 7th Prince of Sayn-Wittgenstein-Berleburg"): Gustav, 7th Prince of Sayn- Wittgenstein- Berleburg( Gustav Frederik Philip Richard; born 12 January 1969), is the eldest child and only son of Princess Benedikte of Denmark and Richard, 6th Prince of Sayn- Wittgenstein- Berleburg.
Relevant evidence: No