The Teacher is one of the new uncommon Family Boss Fight items. Upon first glance, it looks very much like a weapon but surprisingly, it is actually a henchman. The reason for this error is due to a duplicate name in the inventory.
There can only be 1 unique link to a image in the servers. When 2 items share the same link name, the small image and large images for that item will be identical. The Family Boss Fight reward item shares the same server image link name as a reward which was used for the useless My Recruit feature . Although the item is called The Teacher v1, the server image link is named Teacher.
These are 2 unique items and both share the same small image link which is the one that appears on the rewards list and popup.
If you do an inventory search and open the small images, the items also share the same large image. What matters is players who get this item from a Family Boss Fight will indeed get a henchman and it will be the correct item.
Thanks to Scott March for pointing this out on our fan page.