Rosalinda, a few interesting things I came across, not sure if you saw this as well.
If you search the Perthshire Crie/Cree Family Tree on Ancestry. It shows...
Alexander Cree father of....
Alexander Cree 1713-? m. to a Mary Millar
it lists them having 6 children....
Alexander Cree 1736-?
Janet Cree 1739-?
Thomas Cree 1741-?
David Cree 1748-?
Jean Cree 1750-?
Agnes Cree 1753-?
They seem to have marriage dates, which leads me to believe they've proven this with parish records.
What's interesting about that is that it sounds like Thomas Cree might have married a cousin maybe? If his mom was a Miller/Millar, and his wife was, they are most likely related.
There's also the Hall Family Tree that has a few more details..... they have...
Alexander Cree 20 Dec 1713, Forteviot, Perthshire, Scotland
m. to Mary Millar 18 May 1735 - and they have the scan of the parish record.
They've listed Alexander Cree's birthday as 09 May 1736, Forteviot, Perthshire, Scotland.
As well as more exact birthdates for their siblings.
What's interesting about that tree is that they've listed Thomas Cree as marrying Jean Drysdale 30 Aug 1769, Alloa, Clackmannan, Scotland. Not my Catherine Miller 29 Nov 1767, Aberdalgie, Perth, Scotland. They do have a parish transcript, but it doesn't prove that it's the same Thomas Cree from Forteviot, it's still possible, but I tend to think my Thomas Cree is more logically the right one since Aberdalgie is much closer to Forteviot than Alloa.
Ok, I'd say that solves the connection, we're connected through Alexander Cree & Mary Miller/Millar. They're my x6 great-grandparents. Thomas is their son, who married Catherine Miller who must be related to Mary somehow, I'll have to work on figuring out that connection.