I don't understand you logic here at all. In this context a "sister" is another Aes Sedai. Aes Sedai are sisters, Amyrlin is the Mother and novices are children. Property don't have sisters, they're not related to anyone.
Aes Sedai probably couldn't channel to save their biological sisters, because they all understand the Oath to mean just Aes Sedai sisters, and are thus bound by their interpretation.
You almost answered it yourself. "Interpretation". How the AS views the word "sister" in this context is paramount. The AS normally view it to mean another sister, but the oath itself does not make this explicit. As such it seems to me that if a damane could be brainwashed enough that she considered all Seanchan her "sisters", then the oath would allow her to protect other seanchan.
As for biological sisters, I would actually say that some AS probably could. Again it depends on how they view the oath in their minds. If they view the word "sister" to mean AS only then they could not. But if they view the AS-order to be a sisterhood they might link the word "sister" in the oath to family, which means that their real family would likely share this protection.
It is the same idea that allows an AS to say something false if she merely believes it true. What the AS believes in her mind is paramount, and the Seanchan are quite proficient in breaking minds and remolding them into believing what they want.
			The White Tower has all the tools to defeat the Senahcan...
	    
	         - 03/08/2010 10:32:03 PM
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			Re: The White Tower has all the tools to defeat the Senahcan...
	    
	         - 03/08/2010 10:53:38 PM
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			Why not take an oath...
	    
	         - 04/08/2010 12:09:46 AM
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			or just adapt the one power as a weapon oath to include a sister's freedom as well as her life  *NM*
	    
	         - 04/08/2010 01:45:43 AM
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 *NM*
	    
	         - 04/08/2010 01:45:43 AM
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	     *NM*
	    
	         - 04/08/2010 01:45:43 AM
	        414 Views
 *NM*
	    
	         - 04/08/2010 01:45:43 AM
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			Perhaps they would die?
	    
	         - 04/08/2010 09:10:42 AM
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			Re: Perhaps they would die?
	    
	         - 04/08/2010 01:43:02 PM
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			Re: Perhaps they would die?
	    
	         - 04/08/2010 07:14:24 PM
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			Re: Perhaps they would die?
	    
	         - 04/08/2010 07:44:10 PM
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			Re: Perhaps they would die?
	    
	         - 05/08/2010 08:33:18 AM
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			Re: Perhaps they would die?
		
	         - 05/08/2010 01:15:47 PM
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			Re: Perhaps they would die?
	    
	         - 05/08/2010 04:33:25 PM
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			Re: Perhaps they would die?
	    
	         - 06/08/2010 12:02:16 AM
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			they can't
	    
	         - 04/08/2010 12:54:46 AM
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			Re: they can't
	    
	         - 04/08/2010 02:27:45 AM
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			Re: they can't
	    
	         - 04/08/2010 07:09:45 AM
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			Re: they can't
	    
	         - 04/08/2010 02:44:10 PM
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			read the oaths again
	    
	         - 04/08/2010 08:15:24 PM
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			I don't think #1 is as simple as you say.
	    
	         - 04/08/2010 02:22:25 AM
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			For the most part, they can only defend themselves...
	    
	         - 04/08/2010 10:59:23 AM
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			Re: For the most part, they can only defend themselves...
	    
	         - 05/08/2010 01:17:44 AM
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			I think the BT would wipe the floor with the damane on their home turf
	    
	         - 05/08/2010 08:19:38 PM
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			Re: I think the BT would wipe the floor with the damane on their home turf
	    
	         - 05/08/2010 11:57:43 PM
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			Whoa whoa whoa!
	    
	         - 06/08/2010 03:07:34 AM
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			I actually think the opposite: the damane would wipe the floor with the BT
	    
	         - 13/08/2010 11:27:21 PM
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			My thoughts on the damane...
	    
	         - 05/08/2010 04:11:35 AM
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			How exactly would Egwene learn where the Damane are kept?
	    
	         - 05/08/2010 07:57:55 PM
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			Interrogate the Damane.
	    
	         - 05/08/2010 10:32:17 PM
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