Item Familiar on Double Bladed Weapons

[Aiursfallen]

I'm playing a thri kreen ranger going 2WF with two gythkas (double bladed slashing weapons). I want to get the item familiar feat, but on the text for the special ability (Weapon Special Ability) it says you can add the equivalent of a +1 bonus to the weapon: does the bonus acquired only apply to a single blade, like weapon enchantments, or does it apply to the entire weapon?

[PraxisVetli]

I'd say only the one?
but house rule I'd let you

[Galvin]

Normally, if you wanted to pay an enchanter to enchant your weapon, or buy a fresh magical double weapon, you have to pay per blade, and each blade can have different enchantments, so you could have a +1 Keen/+2 Double Sword. Under this logic, I would say the +1 would apply to only 1 blade, because it says add +1 to the weapon, and for terms of enchantment, each blade is counted as a weapon. I would rule that if you used the same ability again, you could put it on the other blade.

[Aiursfallen]

Thank you both for replying. I'd figured that's how it would work. Anyone know how to make a ragewind (MMII).