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Message: <blockquote data-quote="kjenks" data-source="post: 2888623" data-attributes="member: 12892">Basically, the rules don't say.An opponent might be able to complete grapple steps 1 through 3, but not step 4. A DM might decide that the opponent can complete step 4 and end up sharing a square with the horse and the rider, but this is problematic. Picture what happens if a wizard sends his tiny, invisible familiar into an enemy's square to attack, then the wizard's buddy, a fighter, grapples the familiar. The fighter can complete steps 1-3 with no trouble, but can he complete step 4? This is pretty much analogous to the "grappling the rider" situation.Improved Grab is even more unclear, since the grabber does not need to move into the grabee's square(s). But the Improved Grab and grapple rules do not have a mechanism for unseating a rider; that mechanism is in the Trip and Ride rules. Personally, I think that riding a mount makes you pretty much immune to grapple attacks. I think an opponent must unseat you from your mount (by Trip opposed with a Ride check) before grappling you. And I think that a monster trying to use Improved Grab on a rider must grab the mount, not the rider. (And Improved Grab doesn't usually work on a creature the same size as the grabber, making it a bit more difficult for most monsters.)But there's enough gray area in the rules to make this a DM call.</blockquote>