YR, I would suggest that your parents have a nurse come by to check on him when he returns home. Your mother will want to take care of him herself, but if her health is a bit off, it's best to have someone come by. The nurse will not only check on your father, but he/she will be there to answer any questions that your mother may have about your father's care.
I'm also happy to see that your family is stepping in to assist them. It's very difficult for everyone when something such as this occurs. It's good that your brother and sister are w/them at this time. Your turn will come when your father returns home. If you are anything in real life like you are on this bb, your father will have an excellent care taker. Get some rest, for you will be traveling again very soon to be with them.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.