Can I report a father (that I personally know) to the authorities for abusing his children?

He has celiac, has had it all his life and follows a gluten free diet as medical treatment. He has 3+ kids all of whom eat gluten. He said it costs too much for more than one person in family to be on the gluten free diet, but two daughters look quite unhealthy and struggle at school. I very much think they have... show more He has celiac, has had it all his life and follows a gluten free diet as medical treatment. He has 3+ kids all of whom eat gluten. He said it costs too much for more than one person in family to be on the gluten free diet, but two daughters look quite unhealthy and struggle at school. I very much think they have celiac disease but the father refuses to do anything about it.

Is this child abuse? If so, who could I report this to?
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