DALLAS — At birth, there was nothing to suggest 18-year-old twins Gabe and Gatlin Britt, of Heath, were autistic. Until about a year and a half.

“They weren’t talking, they weren’t really responding to their names,” said Sarah Britt, the boys’ mom. “I always held onto hope, but as they got older, that hope kind of got a little dimmer, I guess you could say.”

Sarah says she and her husband remained optimistic, assuming the boys were fully competent, but what proof did they have?

Educators spent the boys’ first 15 years teaching them at about a first-grade level. Likewise, the boys can’t speak and had no way to prove they understood anything.

Then, a couple of years ago, Sarah took Gabe and Gatlin to a local clinic to try something called the Rapid Prompting Method, or RPM, which, in som

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