George William Hartwell (1865-1934) 
|
 | Clara Watts (1867-1953)
|
 | George William Joseph Hartwell (1888-1968)  |
| Horace Bertram Hartwell (1891-1961) |
| Norman Hubert Hartwell (1893-1942) |
| Harold Reginald Hartwell (1894-1933) |
| Percy Cyril Hartwell (1896-1984) |
| Oliver Ralph Hartwell (1898-1918) |
| Charles Henry Hartwell (1899-1918) |
| Robert Hubert Hartwell (1900- ) |
 | Albert Edward Hartwell (1902-1976) |
| Clara Hartwell (1903-1991) |
| Clarence Sidney Hartwell (1906-1935)
|
| Joan Rosaline Bennett (1909-1982)
|
