A wee bit more help back in time,
Looks as if Jessie Coull was a widow when she married William
and William's mother Jane Buddo also lost her husband james Trail before re-marrying
William (born 1859)'s dad William Henderson in the 1850s
   Home:   Shore Head
1881   Census Place:   St Andrews, Fife, Scotland
   
Wm. HENDERSON aged 21    born Sailor St Andrews, Fife, Scotland
Brother of Head of Household James Trail {Step} 
James TRAIL 29 born St Andrews, Fife, Scotland
Head     Fisherman
Elizabeth [Brown] TRAIL 29 born St Andrews, Fife, Scotland
Wife    Fishermans Wife
James B. TRAIL  6    born Dundee, Forfar, Scotland
Son    
Elizabeth W. TRAIL    3 born Dundee, Forfar, Scotland
Daughter
John TRAIL 2 born Dundee, Forfar, Scotland
Son
Isabella TRAIL 10 m born St Andrews, Fife, Scotland
Daughter
JAMES TRAIL 
Birth:  01 FEB 1851   St. Andrews And St. Leonards, Fife, Scotland 
Father:  JAMES TRAIL  
Mother:  JANE BUDDO     
OPR 
StepBrothers
WILLIAM HENDERSON
Birth:  25 MAY 1859   St. Andrews And St. Leonards, Fife, Scotland 
Father:  WILLIAM HENDERSON  
Mother:  JANE BUDDO     
OPR
JAMES BROWN TRAILL
Birth:  26 DEC 1874   Dundee, Angus, Scotland 
Father:  JAMES TRAILL  
Mother:  ELIZABETH BROWN     
OPR
Aye DDJJAKE
JAMES TRAILL 
Spouse:  ELIZABETH BROWN   
Marriage:  12 JAN 1874   Dundee, Angus, Scotland 
OPR