Which relations constitute one tree?

Every tree is by default displayed with the user as the "root" of the tree. The number 430 is profiles within your family group, is not your direct tree, but includes siblings, their children, spouses and so on. As far as I can see your direct ancestor tree is only 14 people, so you might be in the edge of a larger tree. You can take that as a challenge to research and build on your part of the tree.