Question: Who is the father-in-law of Hoël Ii, Duke Of Brittany?
Sentence (from "Hoël II, Duke of Brittany"): Geoffrey Grenonat of Rennes (a natural son of Duke Alan III of Brittany and thus a half-brother of Hawise) led a revolt and was joined by Ralph de Gael who had returned to Brittany from England after the failure of the previous year's Revolt of the Earls.
Relevant evidence: No