| Father | Sir John IV Cokayne ,Chief Baron of Exchequer,Justice of Common Pleas 1406-20 (1358 - 1429) |
| Mother | Lady Edith "Ida" de Grey (1368 - 1426) |
| Sibling | Reginald Cokayne ,of Cokayne Hatley (1406 - 1433) |
| Sibling | Elizabeth Cokayne (1392 - 1426) |
| Sibling | Christina Cokayne (1395 - 1475) |
| Sibling | Elizabeth Cokayne (1396 - 1463) |
| Sibling | Sir John Cokayne (1398 - 1470) |
| Sibling | John Cockayne (1399 - 1471) |
| Sibling | Eleanor Cokayne (1400 - ) |
| Sibling | Elizabeth Cockayne (1400 - ) |
| Sibling | Margaret Cokayne (1405 - 1473) |
| Sibling | Henry Cockayne (1408 - 1470) |
| Sibling | John Cokayne (1408 - ) |
| Sibling | Thomas Cokayne ,Rector of Pulverbach 1413 ( - 1428) |
| Sibling | Sir William Cokayne (1414 - 1415) |
| Sibling | Sir Roger Cokayne (1416 - 1417) |
| Sibling | Lady Ellen Countess Cokyane (1420 - 1442) |