Family gauntlets are a reward for completing the Family Crestquest. Players can take them to any of the three brothers from the quest to have the gauntlets enchanted with a special ability.
If a player loses the gauntlets, they will magically return to Dimintheis who will give them back to the player with their previous enchantment applied. The player may re-obtain the gauntlets in their original form after finishing the quest Defender of Varrock, while not otherwise possessing the gauntlets (including in the player's bank).
Players can only have one of these effects active at a time, and it costs 25,000 coins to change the enchantment. This can be done by right clicking the gauntlets in the player's inventory and choosing from the interface.
There is a bug where the player is unable to change to Goldsmith gauntlets immediately after receiving the Family Gauntlets. The change can be made after first switching them to cooking gauntlets by speaking to Caleb and then right clicking and choosing the switch interface in the player's inventory.