Hi Elbe,
I am not sure if that would be reported in Haddingtonshire Courier as it was known then, As it was end of war, I am sure there would have been lots of people looking up relatives from all parts. It is now known as East Lothian Courier, is online, you can google and it will advise about archives.
I found the marriage of Alexander Whitecross to Jane McFarlan at Luss, on banks of Loch Lomond, that is quite a wee bit away from East Lothian. Have we any certificates to prove they are your relatives. I can see an Alexander Whitecross in East Lothian but I think he died after 1891 census. May need a bit more info before we can progress.
TOm