should i tell tell that my brother's kid is autistic?

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Hi friends,My brothers four year son seems to be autistic,but his parents are ignorant of autism. I can make out from the symptoms like echolalia and communication problem,that he is autistic, but his parents even then as they know that something is wrong,they are confident now that he will improve in future.For any parent its very difficult to accept the fact that their kid is autistic.But am very scared to face them and the situation after I tell them,because they may think that I am cruel and blame me. Now friends can I have your opinions?