Question: Who is Henry O'Brien, 7Th Earl Of Thomond's paternal grandfather?
Sentence (from "Henry O'Brien, 7th Earl of Thomond"): In 1641, he married his first cousin Anne O'Brien (d. September 1645), daughter of Henry O'Brien, 5th Earl of Thomond, by whom he had one son:
After Anne's death, he married Sarah Russell, daughter of Sir Francis Russell, and widow of Sir John Reynolds.
Relevant evidence: No