See also

• Charles Underwood's parents: Richard Charles Underwood (1874-1920) and Matilda Smith (1878-1955)
• Charles Underwood's siblings: Richard Buswell Underwood (1904-1904), Florence Muriel Underwood (1905- ), Clarice Matilda Underwood (1906-1907), Richard John Underwood (1910- ) and Eric Underwood (1911-1994)