I am working on this family as well.
I am also under the impression that William died young, as his wife Mary Jane Haines/Hynes remarried 4 years later to Joseph Raison/Rason.
The George Sacrey living with the Raison family in the Coney Arm census is a son of Mrs. Raison from her first marriage.
Jane Hynes was a sister to Druscilla Hynes.
I have most of the Coney Arm families all sortted out.
William Sacreys sister Jane, also married a Hynes. Married Henry Hynes/Haines. A brother to Mary Jane Hynes