Elsie had 5 siblings, 4 older and one younger. I won't post the source information for them here, because of how G2G renders the paste.
I still haven't found a marriage, either, but it might have been as early as before 1913, as the military record (for Louis Claude) dates from then (unless the NoK was updated for the 1939-1945 war - in which case the wedding would have to be before the first child's birth (or they never married)).