Question: Who is the maternal grandfather of Edmund Stafford, 5Th Earl Of Stafford?

Knowledge 1: Edmund Stafford, 5th Earl of Stafford
Edmund Stafford, 5th Earl of Stafford and 1st Baron Audley, KB, KG (2 March 1377 – 21 July 1403) was the son of Hugh de Stafford, 2nd Earl of Stafford and Philippa de Beauchamp.He inherited the earldom at the age of 18, the third of three out of four brothers to inherit the title.His eldest brother, Sir Ralph, died before inheriting the title and his other two elder brothers died without issue. [SEP] Knowledge 2: Philippa de Beauchamp
Philippa de Beauchamp (before 1344-6 April 1386) was the daughter of Thomas de Beauchamp, 11th Earl of Warwick and Katherine Mortimer.On or before 1 March 1350 she married Hugh de Stafford, 2nd Earl of Stafford, son of Ralph de Stafford,1st Earl of Stafford and Margaret Audley, Baroness Audley.Philippa and Hugh had seven children.
Knowledge 1: Philippa de Beauchamp
Philippa de Beauchamp (before 1344-6 April 1386) was the daughter of Thomas de Beauchamp, 11th Earl of Warwick and Katherine Mortimer.On or before 1 March 1350 she married Hugh de Stafford, 2nd Earl of Stafford, son of Ralph de Stafford,1st Earl of Stafford and Margaret Audley, Baroness Audley.Philippa and Hugh had seven children. [SEP] Knowledge 2: Thomas Stafford, 3rd Earl of Stafford
Thomas Stafford, 3rd Earl of Stafford (c. 1368–4 July 1392) was the second son—but the senior surviving heir—of Hugh Stafford, 2nd Earl of Stafford and Philippa de Beauchamp, daughter of Thomas de Beauchamp, 11th Earl of Warwick.His elder brother, his father's heir, Sir Ralph Stafford, was murdered by Richard II's half-brother, the earl of Huntingdon whilst they were campaigning in Scotland in July 1385.As a result, Thomas became heir to the earldom of Stafford, and in 1390 he was knighted.He gained livery of his estates in 1391 and paid homage to the king for them on 20 October that year.He spent his short career campaigning in France alongside the duke of Gloucester.Thomas Stafford married Anne, daughter of Thomas, Duke of Gloucester around 1390.He died on 4 July 1392 in Westminster, and was interred in Stone, with his father; his widow, Anne, with whom he had had no children, married his youngest brother Edmund Stafford, 5th Earl of Stafford.
Knowledge 1: Edmund Stafford, 5th Earl of Stafford
Edmund Stafford, 5th Earl of Stafford and 1st Baron Audley, KB, KG (2 March 1377 – 21 July 1403) was the son of Hugh de Stafford, 2nd Earl of Stafford and Philippa de Beauchamp.He inherited the earldom at the age of 18, the third of three out of four brothers to inherit the title.His eldest brother, Sir Ralph, died before inheriting the title and his other two elder brothers died without issue. [SEP] Knowledge 2: Thomas Stafford, 3rd Earl of Stafford
Thomas Stafford, 3rd Earl of Stafford (c. 1368–4 July 1392) was the second son—but the senior surviving heir—of Hugh Stafford, 2nd Earl of Stafford and Philippa de Beauchamp, daughter of Thomas de Beauchamp, 11th Earl of Warwick.His elder brother, his father's heir, Sir Ralph Stafford, was murdered by Richard II's half-brother, the earl of Huntingdon whilst they were campaigning in Scotland in July 1385.As a result, Thomas became heir to the earldom of Stafford, and in 1390 he was knighted.He gained livery of his estates in 1391 and paid homage to the king for them on 20 October that year.He spent his short career campaigning in France alongside the duke of Gloucester.Thomas Stafford married Anne, daughter of Thomas, Duke of Gloucester around 1390.He died on 4 July 1392 in Westminster, and was interred in Stone, with his father; his widow, Anne, with whom he had had no children, married his youngest brother Edmund Stafford, 5th Earl of Stafford.

Answer: Thomas de Beauchamp