My wife has an I phone 4 and ipad2 and so do I. Some of her apps have synced to my iPad and iPhone and she has forgot her apple Id. Some of the apps have updates and when I try to update them it pops her old email address up and ask for her apple id. I don't know what to do to get this issue resolved. Can anyone tell me what to do. I don't know if I should call apple and let them try to resolve this issue or maybe someone here can tell me what to do

Perhaps this will help
Apple - Support - Apple ID

Look in the middle under "Forgot Apple ID or Password"