Douglas of Friarshaw from Douglas of Cavers

Hello

I am researching the Douglas from Friarshaws.

On the top of the page, it indicates that they originate from the Douglas of Cavers. However, I cannot seem to find the Ancestor that links the lines!

Can anyone tell me who the Decendant from Wm Douglas(1150) is the last of that line?

I would just like to see where the branch ended from the main Douglas Tree.

Thank You!

Lori