I can join his party but not his game. Can anyone help me fix this problem?

Hi there,

Remeeming errors can be caused by issues on the account itself. Be sure to check if your billing information is correct at
http://billing.microsoft.com and also check
http://account.microsoft.com/services for any outstanding amount issues, these need to be sorted prior to being able to redeem codes.

After that try redeeming the code on both xbox console and via xbox.com/redeemcode

Also check that the Xbox Live account , the console and code all match region wise, using different regions for any of them cause issues too.

If you can't find anything wrong and it is still not working, best thing to do is to contact official Xbox Support via Phone or Microsoft Support Chat at
http://support.xbox.com/contact-us they can do a more indepth look into this issue.

Hello there in order to game share you need to set your cousins profile as the home console on your xbox. & your cousin need so set your profile as hone console on his xbox. this should solve all issues.

I need help with this toooo. My friend gameshared with me, and I can pla y his games bit not use his live or join parties

For the IP address do I just make one up or what! I don't know much about this kind of stuff. But if that was the problem wouldn't I not be able to connect to anyone? I can connect to other parties and play online no problem, just can't connect to his party
or join his game. But I'm definitely willing to give it a try.

There isn't any option for transferring points between account. They're a credit and like with any service, credits are not transferrable.

You would be able to buy the content with the first tag and use it with the second. There are a few exceptions to this shared useage thought - things like avatar items and ELITE are not shareable.