My first question would be "what did your cousin do to him as a puppy?" Dogs never forget when someone did something to them. He could have played rough with him, kicked him, accidentally hurt him, and so on.
If your cousin was never alone with Siriss and you can swear that there was nothing bad done to him, then perhaps he just plain doesn't like your cousin. He might move in a manner Siriss doesn't like. He might smell like something Siriss doesn't like.
Edit -- I just saw your response for therapy dog. Make sure he is socialized to the hilt. Have you gone for his CGC yet?






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