Family Crest/Quick guide

Caleb's piece

 * Talk to Dimintheis in the south-west corner of Varrock.
 * Gertrude's house is west of Varrock, talk to Caleb.
 * Talk to him again to recieve a Crest part.
 * Ask Caleb where the rest of the crest is.

Avan's piece

 * Al Kharid, talk to the gem trader.
 * Run north to the Al Kharid mine, talk to Avan.
 * Go to the Dwarven Mines (under Ice Mountain). South-west of the general store, talk to Boot.
 * East of Ardougne docks are some old ruins. Climb down the ruins.
 * Logging out will reset this puzzle
 * Run north and pull the lever next to the door.
 * Run into the southern room and pull the lever.
 * Run back to the northern wall and pull the lever.
 * Enter the northern room and pull the lever.
 * Leave the room and pull the lever on the northern wall.
 * Run into the southern room and pull the lever.
 * Mine 2 gold ore in the hellhound room.
 * Smelt the ores into a ruby ring and ruby necklace at any furnace.
 * Give them to Avan.

Johnathon's piece

 * North-east of Varrock is the Jolly Boar Inn. Talk to Johnathon on the first floor.
 * Use an anti-poison on him.
 * Teleport to Edgeville and prepare for the final fight (Multiple casts of the 4 blast spells).
 * Enter Edgeville Dungeon and run north, then west.
 * Cast Air, Water, Earth and Fire waves on Chronozon - They must damage him to count.
 * Kill him and take the crest piece.

Finishing up

 * Assemble the crest by using the parts on each other.
 * Talk to Dimintheis.
 * Quest complete!
 * Destroy the gauntlets and re-obtain the gloves from Dimintheis. There is currently a bug where the brothers will refuse to enchant your gloves unless you've done this.