Hi a very warm welcome to BTG . I personally cant give you any advice on shunts etc but there are others here that can.
It is very early days...your father will be confused, and very tired, i was much the same. It does get better . Wanted to welcome you and
wish you and your Dad well, please let us know how you are all doing, and ask away, as there are lots of us here that can help and support you.
Take care
Love Tina xx