The only female Sheard who fits in Brian's burial index is
SHEARD, Margaret 54 Ger 15 May 1922

there is a marriage
SHEARD, William John 12 Aug 1894 P ger 101 BANNAN, Margaret 10 The Green

The 1881 census gives
Robert Bannon (41 ag lab andreas) + Ann Bannon (char woman 41 Andreas + fam inc Margaret Bannon - 10 The Green Peel (moved c. 1877)

William John s/o William Sheard (age 46 Mariner Peel) + Margaret (44, Patrick) 3 Station Rd Peel

william prob s/o John Sherd + sarah greenoff Ger 18310227

as list of pre 1840 bapts:

Ger 1826-07-16 SHERD HANNAH c/o JOHN + SARAH GREENHAW
Ger 18280108 SHERD WILLIAM c/o JOHN + SARAH GREENOTT
Ger 18290510 SHERD RUTH c/o JOHN + SARAH GREENOP
Ger 18310227 SHERD WILLIAM c/o JOHN + SARAH GREENOFF
Ger 18321230 SHERD SAMUEL c/o JOHN + SARAH GREENOFF
DSM 18341119 SHEARD FRANCIS c/o JOHN + SARAH GREENHOPE
DSB 18370126 SHEARD DANIEL c/o JOHN + SARAH GREENOFF bur Bra 18370822
Ger 18381102 SHEARD DANIEL c/o JOHN + SARAH GREEVES bur Pat 18400131

Ger 18120802 SHERD JAMES c/o JOHN + ELIZABETH CORKILL m Ger 18111226
Ger 18160128 SHERD JOHN c/o JOHN + ELIZTH CORKILL
Ger 18180201 SHERD CHARLOTTE c/o JOHN + ELIZABETH CORKILL
Pat 18200730 SHEARD SUSAN c/o JOHN + ELIZABETH CORKIL bur Pat 18200830
Pat 18211104 SHEARD SAML c/o JOHN + ELIZTH CORKILL
Ger 18231019 SHERD DANIEL c/o JOHN + ELIZABETH CORKILL

DSM 18341207 SHEARD JOHN c/o JAMES + ELIZABETH CANNELL m Bra 18340111
DSM 18360124 SHEARD SARAH ANN c/o JAS + ELIZABETH CANNELL
DSM 18371217 SHEARD MARGT c/o JAMES + ELIZABETH CANNELL
DSM 18400816 SHEARD ANN c/o JAMES + ELIZTH CANNELL

thus Wm would be most likely s/o John + Sarah tho age should be 50

Wm John bapt 11 OCT 1867 s/o William + Margaret Kegg

wm + Margt m 26 APR 1853 at Kk German