I think the Frédérick who wed Clara could have been a younger brother of Alfred.
I don't think he was connected to Alfred.  Alfred was 47 in 1911 so born 1863-64.  If he was connected - why is he not with either John or Susanna in 1871?  Where is his birth reg? 
1861 June qtr STOKELEY  ALBERT  HOWELL  mmn    HOWELL     
MITFORD  Volume 04B  Page 291   
December qtr 1863 STOKELY, FREDERICK  WILLIAM mmn     HOWELL     
MITFORD  Volume 04B  Page 290
1866  Sept qtr STOKELY, MARY  SOPHIA  mmn    HOWELL     
MITFORD  Volume 04B  Page 267