Hello again everybody, a little twist in the story. I was on a website, where a distant relative, we had the same great great grandfather.
Now his tree was the same as mine up until Alexander Wannan married to Janet Mcintosh in Coupar Angus in 1798.
But then he matched a different person.
He matched with a
John Wannan married to jean Brown in Cargill in 1765.
Their children are the following
George born 1766
John born 1770
Alexander 1772 (the name has been written as Wanan and no mother mentioned)
Elizabeth 1775
Walter 1777
Margaret born 1780.
John Wannan married to Jean Brown, could be the son of George Wannan and Janet Corse married in Cargill and Inchture (there are two entries in 1739)
I think I already went down this waywhen I first started, but at that time I didn't know about the scottish naming traditions, in fact I only learnt about that last week from the site, and it could explain that John was the eldest son of Alexander Wannan and janet Mcintosh.
more food for thought.