Edward married his cousin, Joan, Countess of Kent (1328–1385), on 10 October 1361.
She was the daughter and heiress of Edmund, Earl of Kent, the younger son of King Edward I by his second wife Margaret of France.

They had two sons, both born in Aquitaine:
Edward, born at Angoulême on 27 July 1364.
died immediately before his father's return to England in January 1371, and was buried in the church of the Austin Friars, London
Richard who succeeded his grandfather on the throne as Richard II of England
From his marriage to Joan, he also became stepfather to her children by Thomas Holland:
Thomas Holland, 2nd Earl of Kent whose daughter, Joan Holland, later married Edward's brother, Edmund of Langley.

John Holland, 1st Duke of Exeter, who married Edward's niece, Elizabeth of Lancaster, daughter of his brother, John of Gaunt.

Joan Holland, Duchess of Brittany
Edward had several natural sons before his marriage.

With Edith de Willesford (died after 1385):
Sir Roger Clarendon (c. 1352 – executed 1402); he married Margaret (d. 1382), a daughter of John Fleming, Baron de la Roche.

With unknown mother:
Sir John Sounders
Edward married his cousin, Joan, Countess of Kent (1328–1385), on 10 October 1361. She was the daughter and heiress of Edmund, Earl of Kent, the younger son of King Edward I by his second wife Margaret of France.
They had two sons, both born in Aquitaine:
Edward, born at Angoulême on 27 July 1364. died immediately before his father's return to England in January 1371, and was buried in the church of the Austin Friars, London
Richard who succeeded his grandfather on the throne as Richard II of England
From his marriage to Joan, he also became stepfather to her children by Thomas Holland:
Thomas Holland, 2nd Earl of Kent whose daughter, Joan Holland, later married Edward's brother, Edmund of Langley.
John Holland, 1st Duke of Exeter, who married Edward's niece, Elizabeth of Lancaster, daughter of his brother, John of Gaunt.
Joan Holland, Duchess of Brittany
Edward had several natural sons before his marriage.
With Edith de Willesford (died after 1385):
Sir Roger Clarendon (c. 1352 – executed 1402); he married Margaret (d. 1382), a daughter of John Fleming, Baron de la Roche.
With unknown mother:
Sir John Sounders
Edward the Black Prince