Bless your family...especially your son...this must be a really trying time for you all. I, personally, appreciate the sacrifice that you are making and the bravery of your son. Thank you!
About your dogs...don't worry too much about your Border Collie nipping at your pup. This is normal behavior and your BC is just trying to let your dood know who is top dog. Once they establish that, they will become great friends!