The leaving out the address was intentional then saying he would call back with it? They obviously don't want you there. Also, as soon as you mention to another relative he didn't give you the address, they will give it to you. Which means you have no excuse not to go. Except that they dont want you there. This is way to much drama, and I personally wouldn't go.
Have a get together on your own day. With those you don't see often.