Question: Who is the father-in-law of Louise Of Mecklenburg-Güstrow?
Sentence (from "John Albert II, Duke of Mecklenburg"): From 1608 to 1611, he was the nominal ruler of Mecklenburg- Schwerin; the actual ruler being the regent, his great- uncle Charles I. From 1611 to 1621 John Albert and his brother Adolf Frederick I jointly ruled the whole Duchy of Mecklenburg.
Relevant evidence: No