chomsky and sign language

A controversial figure, Chomsky equates sign languages with spoken languages in this article on The spontaneous invention of language. I know about the story of Nicaraguan Sign Language to which he refers, but I’m not familiar with the other case in which he says three deaf siblings of non-deaf/anti-sign parents, by age 3 or 4, had “developed a language. When it was investigated, it was found that it had the properties of normal language for children their age.”
It would be very cool to know what he means by “normal properties”.
thanks Annmarie!

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