Question: Who is the paternal grandmother of Henry O'Brien, Lord Ibrackan?
Sentence (from "Henry O'Brien, 7th Earl of Thomond"): Henry O'Brien, 7th Earl of Thomond PC (Ire) (c. 16202 May 1691) was an Irish peer, styled Lord Ibrackan from 1639 to 1657.
Relevant evidence: No