Not sure about the dog. I think scabies is host specific, and a human problem. Not absolutely certain though.It's usually human to human contact, though possibly may be from other peoples' clothes.
Get your Dad to check every little itch for any redness, and get started on treatment ASAP.
I realise you are in your winter now, and washing all the bedding etc may be a problem, but if you can't do everything in one go, put everything into plastic bags and seal well. The scabies mite won't last long off the host, but the eggs will survive. Eggs can be transferred by scratching.
I hope you can get everyone happy and itch-free by Christmas.
Your parents may not want other people to know about this, as social attitudes are still a little out of date. Not sure of the age of your parents, but the older they are probably the greater the stigma.
Good luck.
Carol
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