Richard de Vere
Richard was born about 1385.  He died on February 15th, 1417.

 Alice Sergeaux
Alice was born before 1393.

 John de Vere, 12th Earl of Oxford
John was born on April 23rd, 1408.  He died at the age of 53 on February 26th, 1462.

 Sir Robert de Vere
Robert was born before 1417.