I have a son, Mason, who is disabled - cerebral palsy - and he does not walk independently, sit independently or speak. He uses a talking computer. I started becoming an advocate for him when he was 3 years old.
The first precept was never to accept a thing as true until I knew it as such without a single doubt.
We decided to play the NEC because we were asked to, and because we actually rather like the place: we've always enjoyed doing it before. We don't often get sensible offers to play in the UK, so most years we just play on the mainland, with the occasional exotic detour.