Hi Avril
Trying to help here

From what you have said, you have seen Euphemia and Gavin's 1871 marriage cert. Her parents do show as John Smith and Jessie Young, however, her father John shows as a labourer and already deceased at the time of the marriage in early 1871.
The John Smith from Haddington, discussed here, was a bootmaker by trade and still alive with wife Elizabeth a little after the marriage of Euphemia in 1871:
John Smith 50, boot maker b. Haddington
Jessie Smith 50, b. Haddington
Elizabeth Smith 13
John Smith 71, son - probably 11 rather than 71!
George Smith 9
Address: High Street, Haddinton
It looks like there were two couples with the same names in the general area, not uncommon. It also explains why you are finding no reference to Euphemia as part of this Haddington family.
Euphemia is showing as born in Dunbar in her census entries. The entry I posted earlier for 1861 I think is likely hers:
Janet Young 39, farm servant b. N Berwick, Haddingtonshire
Fanny Young 16, farm servant b. England, Northamptonshire
Euphemia Smith 8, b. Dunbar
John Smith 7, b. Dunbar
Address: Lawhead Develling Houses, Whitekirk and Tynninghame, East Lothian
Janet as you know is a variant of Jessie.
One thing to take care with when using IGI for a parent search is that it brings up any children born to couple(s) with the same names. Sometimes it is very clear that all the children belong to one couple, other times you have to determine yourself sometimes by adding additional filters or checking censuses etc. whether there is more than one set of parents coming up on the search results.
Monica
