Aubrey-Fletcher was the only son and second child of Sir Lancelot Aubrey-Fletcher, 5th Baronet and Emily Harriet Wade, though his father had already had another son by a previous marriage, but the child died in infancy.
Aubrey-Fletcher adalah putra tunggal dan anak kedua dari pasangan Sir Lancelot Aubrey-Fletcher, 5th Baronet dan Emily Harriet Wade, meskipun ayahnya telah memiliki putra lainnya pada pernikahan sebelumnya, namun anak tersebut wafat saat bayi.