The Redwall Family Tree Poster was a potential project announced in Redwall.org's "Ask Brian" series by Brian Jacques. Brian indicated it would be similar to the Redwall Map & Riddler. However, nothing seemed to have came of this plan.
In Ask Brian, Volume 3, Brian answered a reader who asked:
"Have you considered compiling a Redwall Anthology or a Redwall "coffee table book" (those large rectangular books) full of large glossy pictures of book covers and other pictures an also a compilation of names that includes a "family tree" for characters..."
I think most readers would prefer that I write another Novel, but plans are in hand for a Family tree poster, a companion to the wonderful Map poster which is now available.
The Redwall Wiki has compiled every character family tree here. Please visit the Redwall Family Trees page for more information.