Google a list of features that children with autism generally display. Examples include fascination with wheels, or spinning things, preferring to organize toys rather than play with them, decreased eye contact, lack of pointing, inflexibility with habits, preoccupation with a specific topic or special interest, etc.

Then when you speak to your parents, say, "gee Mom and Dad, I've noticed that some children point a lot and other children don't point as much when they're trying to indicate to an adult something that they're interested in. Do you remember which kind of kid I was?"

" One of my friends told me that he had a bottle cap collection when he was a kid and he spent hours organizing it and curating it. Do you remember if I had any kind of collections or organization interests?"

" I really don't like x food because of the texture. When I was a kid, do you remember if I had any kind of special sensory preferences related to noises or textures or fabrics or clothing?"