This question is an exact duplicate of:
When my wife travels to the south later this year, will she able to play her iTunes music on her iPad2 at her dad's home? Will she simply need to log into his home network to do so?
Basically, we have the music which he doesn't, and we're trying to determine how to best share our music at his home. (Note: my wife's iPad is synced with our iMac, and the music is a combination of iTunes purchases and our own CDs that have been ripped to the iMac). Her dad will be in California next week; can he simply log into my network (iTunes account) and access my music? Or is the issue the fact that he and I have separate iTunes accounts?