Hi
Sometimes it does seem a smaller world than you think! I am a bit rusty on this side of my family as in recent months I have been concentrating on my Welsh side! John Laurance and Eleonora Shand is as far back as I have managed to trace on this particular branch. The only reference I have for John Laurance and Eleonora Shand marrying is that kindly found by JAP on the IGI site (otherwise known as familysearch.org, the "Mormon" site, Church of the later day saints. Yes, it is confusing!). Therefore it is very nice to have some independent confirmation that they actually did exist and got married (IGI references are quite often unsubstantiated and have just been entered by contributors). If you have more details that go back further than this I would be delighted to have them. Also if you have specific references for the marriage of John and Eleanora (so I can order) or a copy you can E-Mail me that would also be great.
I don't think there is anything wrong with your 1851 census records as my Elenora in 1851 (Helenora in 1841!) is Elenora Clark the daughter of Isabella Clark (ne: Laurance), and Granddaughter of Eleonora Shand. The specific references for Isabell (Laurence), her husband James Clark and their many children (Elenora, George, etc.). 1851 reference is Parish: Lonmay; ED:2; Line 10, Year 1851. 1841 reference is Parish: Lonmay; ED:4, Year 1841).
Your 1851 search ties up exactly with what JAP found on Freecen
"1851 has, at Nether Tyahesnook Lonmay, George 40 b. Rathen (he's in the IGI, b 1811, mother's name actually listed!), mother Eleanora S 65 b Rathen, sister Eleanor 38, sister Jean 28, brother Robert 27, servant (presumably sister) Christian 23 all b Lonmay."
and JAP also found an earlier entry in the 1841 Census (I wouldn't woory too much about some of the age discrepancies between 1841 and 1851, discrepancies are common and the 1841 ages tend to be more inaccurate):
Piece: SCT1841/219 Place: Lonmay -Aberdeenshire Enumeration District: 3
Civil Parish: Lonmay Ecclesiastical Parish, Village or Island: -
Folio: 3 Page: 5
Address: Craigellie
LAURANCE George M 25 Agriculture Aberdeenshire
LAURANCE Eleonora F 54 Aberdeenshire
LAURANCE Eleonora F 23 Aberdeenshire
LAURANCE Jean F 20 Aberdeenshire
LAURANCE Robert M 17 Aberdeenshire
LAURANCE Christian F 12 Aberdeenshire
PETERKIN Alexander M 18 Ag Lab Aberdeenshire
FRASER Alexander M 13 Ag Lab Aberdeenshire
SHAND John M 20 Ag Lab Aberdeenshire
LEDINGHAM John M 42 Bookseller Outside Census County (1841
As I said I am a bit rusty on this side of the family at present, but hopefully I have got the right end of the stick and I hope this clarifies things for you.
As JAP says Freecen has the Lonmay 1841 and 1851 Census returns for Lonmay so if you go to
http://freecen.rootsweb.com/cgi/search.pl enter laurance (or variations of this) as Surname, select Year as 1841 or 1851 and choose Census place as Lonmay and finally click on Find it will bring up all the Laurences it can find on the Census for those years. You may find members of the family you were unaware of!
My branch is Eleonora Shand + John Laurance to Isabella Laurance + James Clark to Isabella Clark + Alexander Murray etc. If this branch of the tree is of any use to you I can send you more details