This book was written in the 80's possibly. The book opened with the male antagonist having amnesia and a broken leg. The family can travel upon the "road" and it changes. They can contact each-other using cards, like the ace or the queen. Who wrote this, I must know.
Yes, that's going to be Nine Princes in Amber by Roger Zelazny, the first in a series of five, later followed by a second series of five. Corwin (the protagonist, not the antagonist) wakes up with amnesia and a cast on his leg, but immediately removes the cast and finds that his leg has already healed.