The very nature of our human body is the source of several cultures, including physical and mental capacities. These cultures often extend beyond the person as loved ones are often drawn into the culture even though they do not display the general traits of the culture.
For example, the parents and siblings of an autistic person is likely to develop strong tendencies toward the practices of "mentally special" individuals. They also become involved in the extensive support network that brings them into contact with other families. These relationship mold their life experiences as they see the beauty and utmost humanity of these cultures.