i have the same type of issue. I have an iphone and my wife an ipod touch. we use seperate accounts however we would both like to stream to the same pc.
The only way i've found to do it so far is to log out of your cloud in the control panel and log in to hers. This will disable your photo streaming until you log back out of hers and into yours. you have to remember to check the photo streaming box.
I wish someone would tell us how to leave 2 clouds open at the same time. that would save a lt of time logging in and out.
Hope this helps somewhat. it's not convenient but at least you'll be able to get your pictures onto your pc. you will not however be able to stream from one device to the next. you will have to transfer the photos into the upload file to get them from say your iphone onto her ipad
I'm looking a for a similar answer. I think the method may be to use an iCloud account you share for the photo stream and then use your separate iCloud accounts for everything else. You can have more than one account at a time on your iPhone and Mac and then toggle on the services you use from each.
It's clunky, but I think it would work.
I have the same question. We have 2 iPhones with two iCould accounts. But we are using the same Windows 7 PC computer with the same user account.
I believe if I create a separate Windows account I would be able to setup another iCloud Photo Stream. But we used to use single Windows account. And I can't see any easy way of getting two photo streams into a single Windows account.