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I am sorry to hear this.
Are you saying the only harm was to scratches on your father's arm?
You can report this to public health and you can also report this to the store where your parents bought the soap and you can also report this to the soap manufacturer. But, aside from getting a replacement bar of soap there is nothing that your father would be entitled to because fortunately neither he nor your mother were harmed.
There has to be damages before they can be a lawsuit. There's nothing here for the courts to award because no one was harmed, thankfully.
Do you see what I mean?
You are very welcome.Take good care.