I have to say that last week I found myself viewing from a side of this question/issue I never thought I would.
My DH, DD and I were on a boat from the Studio to Epcot last week when a woman drove onto the boat using an
ECV. She had a soft cast on her leg and during the boat trip, she put her leg straight up to rest it on the tiller of the ECV (foot in the air) and rode like that the whole trip. DD looked at the woman and signed "funny" to me, pointing at the woman. I said her leg probably felt good to be stretched. Well, DD gets obsessed with things, kept looking at the woman and signing "funny" and laughing. One thing that she has a lot of problem with is emotional control - her neurologists have explained it is similar to the problems some people have after a stroke - a little sadness causes oceans of tears, something a little funny causes gales of laughter. Once she gets going, there is not much she can do to control herself and she is very difficult to get off the subject. There was not enough room to turn DD's wheelchair (and it would not have helped much anyway, as she would have probably just turned her head and body around to look anyway). About all I could do was say, "I know you have never seen someone do that before, but it probably feels good to stretch" and "that's enough" as I tried to get her to calm down.
I wanted to say something to the woman, but had no idea what would not make the situation worse. Luckily, she understood because she gave DD a big smile and a wave when she got off the boat.
Anyway, we sometimes get small children questioning and looking. Since DD is not able to speak, I do tell them that she can't talk, but does understand perfectly well. If they ask why she is using a wheelchair, I just say that her legs don't work so she uses the wheelchair to get around. If they ask why she can't talk, I say that she can't talk with her voice, but does talk with her hands (she does modified signing). If they ask the eternal "why, why, why" I say that I don't know why, except that not everyone is the same and some people (like me) need glasses and other people (like DD) need wheelchairs.
I appreciate the parents who don't 'shush' their children and do say something like "I suppose she uses the wheelchair to move around". The weirdest situation we had was when a mother's answer was "She was probably in an accident," which brought up a lot more questions from the child, that the mom then tried to 'shush'. I did get involved at that point and said DD's legs don't work for walking, but that she was born that way.
For the OP, a website called eparent.com has a good
library of books on many different disabilities. Exceptional Parent magazine has been around for many years and is an excellent resource. I have never liked the name of it (the "Exceptional" part, but it was established in a time when people were trying to come up with alternatives to "retarded" and "handicapped". There are still no good words that everyone agrees on. Some people have no problem with "disabled", but think "handicapped" is demeaning or vice versa. Some people refer to themselves or their children as "confined to a wheelchair". That one has always rubbed me the wrong way because it sounds like the person is chained to it against their will.
For my DD, her wheelchair is her freedom. If she is in it, she can move around. If she is out of it, she is pretty well confined to where she is placed (other than rolling herself around if she is on the floor).
So, hearing "confined" is like fingernails on a chalkboard to my ears, but some people are just fine with it.