You can go into the Friends & Family list in
MDE. From there, click on the EDIT button next to the name you want to delete. Scroll down on the next page and click REMOVE.
I haven't figured out how to remove old, expired passes. I can see used tickets from my sister and brother-in-law that I know have no entitlements on them but the "cards" still shows under their names. These are not old room keys. They are tickets that were used and have no more admissions left on them. I can deactivate the "cards", but I cannot remove them.