How does itunes syncing work?

Okay, so I have an iphone and my dad has an itouch. When I plug my phone in, on itunes my dads account and email address comes up since i use his to get Apps.
so I was wondering, whatever pictures or videos i put on my phone from my computer, will that sync to my dads itouch since its his account as well as my iphone? Or will it only go to my iphone?

In iTunes, you can select what is synchronized from your iPhone. You can sync apps (but you don't need to), you can sync all (or part) of your music, movie, and TV show libraries, all or some books, and all or some photos (or no photos at all).To select your options, in iTunes, select your iPhone from under Devices on the sidebar, and you will see the sync options in the various tabs (apps, music, etc.) at top.

You can also, of course, only *put* photos onto the computer without syncing other photos (i.e.those that came from his iPod Touch) to your phone. To do that, you wouldn't sync photos from iTunes, but you can use iPhoto or Picasa or Image Capture to download images from your iPhone every time it's connected.

And of course you have other options like using the Google+ app to automatically upload photos to an online album or you can use the Photostream with iCloud do wirelessly share photos with your father's iCloud account.

It's worth noting that you can have a separate App Store account and a separate iCloud account for everything else (like your photos, calendar… ). You just sign in to iCloud from Settings with your own account and from the App Store you sign in with a different account.