Question: Who is the sibling-in-law of Charles Stuart, 1St Earl Of Lennox?
Sentence (from "Charles Stuart, 1st Earl of Lennox"): Charles Stuart, 1st (or 5th) Earl of Lennox (April or May 1557 – April 1576), was the fourth son of Matthew Stewart, 4th Earl of Lennox and Margaret Douglas, daughter of Margaret Tudor and granddaughter of King Henry VII of England.
Relevant evidence: No