My father was attacked and beaten on the head with a shavel which led to him being in a coma for 2 and half months now he has huge memory loss.?

Sorry to hear this. I'm sorry to hear that this happened to your father. I hope your father will regain his memory or be able to carry on and make new memories. I also hope that you'll get the support you need in dealing with this difficult situation. When a patient has been in a coma for an extended period of time there are often memory problems and cognitive difficulties that can be helped through rehabilitation.