Questions about how to get my parents living on post with us.?

My mom came and lived with us for quite a while at three different posts. Stewart, Riley and now Huachuca. They don't have to be dependent upon you, but there needs to be a reason for them living with you if they aren't. Health issues on their part or yours, assistance during deployments, things of that sort. I have some health issues and have had multiple surgeries so they okay'd her living with us for that reason. They didn't ask for documentation and they even put us on the list for a house with one more bedroom then we currently are living in. She received an ID card and a sticker for her car. I would just talk to housing and work it out. Usually they are pretty understanding.