It seems to me that for the most part, contemporary metaphysicians seem to take relations to be fundamental. It is the thing with which they talk of everything else, this is a very important point for me as I don't think what that what we call relations are any relations at all. Here are a few questions;
(1) What do contemporary metaphysicians mean when they say 'x' is fundamental?
(1a) As far as I understand it, they seem to say that it cannot be reduced to something else.
(2) From what I've read, I don't think metaphysicians would argue that causation is fundamental, since it can be reduced to talks of relations, so,
(2a) What did the Scholastics usually take to be fundamental, and why?
(2b) What do contemporary metaphysicians take to be fundamental, and why?