I've been through a similar kind of thing, in a way. As soon as it was clear that I was not a "typically developing" child, their whole tone changed to me. I was about 4 or 5 at the time and when it became clear that there was something not quite right with me, my mother was angry and in denial. I never saw any kind of mental health services, ever. No one took me and I was advised not to go. As years went on, I began to progressively "lose it" over time. I used to be basically functional, as a kid. Now, not so much. I have much more difficulty functioning in the world and I also have developed some paranoid and delusional thinking along with my other problems. It is difficult for them to deny it now and they have become more accepting because it is clear that I have become very, very sick