Four or more generations of descendants of George Albert Blackman (1868-1938) if they are properly linked:
1. George Albert Blackman (1868-1938)
- 2. George Samuel Blackman (1897-1897)
- 2. Frederick John Blackman (1898-1987)
- 2. Olive Victoria Blackman (1900-1997)
- 2. Harold Sidney Blackman (1903-1997)
- 2. Oswald George Blackman (1906-1978)