Be sure to include VA form 21-0845 (Authorization to Disclose Personal Information to a Third Party) if you are filing for your loved one and need to oversee the application process. Without this authorization, the VA will not discuss the application with you.
Never send originals and ALWAYS send all correspondence via Certified Mail "Registered Return Receipt" as well as keeping a complete copy of everything for your own records. If you are in the process of completing an A&A claim, the VA states, "It is not necessary to request a duplicate copy of a veteran's discharge or separation papers solely for the purpose of filing a claim for VA Benefits. If complete information about the veteran's service is furnished on the application, the VA will obtain verification of service." In spite of what the VA says, we recommend including a copy to avoid any imposed delay.
Here are complete instructions on How to Apply for the Aid and Attendance Benefit.