I was thinking about similar weapon specialization.
If brother use a specific weapon with success(kills, damage) he earn XP for that weapon and weapon family.
#Brother using Short Sword with great success.
#He gain level up in Short swords(also get half or less points in other similar weapons).
#Bonus levels in weapon specialisations can give a brother bonus chance to hit with this weapon or bigger damage or some additional skills.
#Like basic Short Sword skills allow brother use only Slash skill, Normal allow use Riposte, Advanced allow for Thrust(or Penetrate).
Granting various levels for fresh brothers can also make them different(additional tool alongside Traits and Backgrounds and Stats).
