Are you sure about that?

If his daughter has a different/new AppleID, then AFAIK, you can't put any purchased music/apps/games/etc on that other phone.

As for iCloud:
Quote:
iCloud requires iOS 5 on iPhone 3GS or later, iPod touch (3rd and 4th generation), iPad, or iPad 2; a Mac computer with OS X Lion; or a PC with Windows Vista or Windows 7 (Outlook 2007 or 2010 or an up-to-date browser is required for accessing email, contacts, and calendars). Some features require a Wi-Fi connection. Some features are not available in all countries. Access to some services is limited to 10 devices.
Music features of iCloud require iOS 4.3.3 or later on iPhone 3GS or later, iPod touch (3rd and 4th generation), iPad, or iPad 2; iOS 5 on iPhone 4 (CDMA model); or a Mac or PC with iTunes 10.3.1 or later. Download iTunes 10.5 free.




wiFi Sync, which is what you asked about:

Quote:

Wi-Fi Sync
Wirelessly sync your iOS device to your Mac or PC over a shared Wi-Fi connection. Every time you connect your iOS device to a power source (say, overnight for charging), it automatically syncs and backs up any new content to iTunes. So you always have your movies, TV shows, home videos, and photo albums everywhere you want them.


You set that up in iTunes