I started off by telling them that I had something to say and said that I wear women's clothing. My mum laughed and said they had known for ages, recalling all the times she had found my sisters clothes stashed away somewhere in my room and once when she actually caught me dressed up. She never confronted me about it because it would have been embarrassing for me and they thought it was a phase that would pass. When they saw the photo's of me dressed up for a comic con under the pretense of a bet was when they finally knew for sure. They both said that they accepted it fully (my Dad was especially adamant about that) but expressed confusion as to why I did it, my mum saying that men just look stupid in dresses because it doesn't suit them and they hold themselves wrong. I suppose it's going to take a bit of time to make them really realize that there is a big difference between a non-binary person such as myself and a guy who just likes wearing dresses (indeed I need to make them aware that there is such a thing as non-binary genders) but hopefully my art project on the subject will educate them as it progresses. Considering my Mum thinks that Eddie Izzard just crossdresses as a gimmick I might have my work cut out for me a bit >_<
They did both say they'd be fine with me dressing around the house and my Dad expressed quite a bit of interest in my project even though he's not really into art, so that's always good. He did briefly ask if I wanted to become a woman but it seemed to be in a more jokey way than a serious way.
Got a long way to go with this I think but can't really ask for a much better start.