Subdural Hematoma -father

My father is 74 years old who fell 2months ago while out for a walk.Six weeks later we took him to hospital where we discovered he had a slow brain bleed.He deteriorated almost overnight in the sixth week.We probably missed some earlier symptoms due to he has parkinsons and sometimes needs his meds adjusted.He was very functional and we had an appointment for his parkinsons doctor when this major problem occurred.He needed 4 bur holes to relieve pressure.It`s one month later and just this past week he was finally making progress.Eating on his own full meals.his physical therapy was slow but could walk with assistance.They placed him in a subcute facility after the hospital.4 days later he was sent back to hospital w/halucinations,eyes rolling back in head,and flayling his arms.They say he may have a urinary tract infection that is causing these latest symptoms.I`ve also been told that he still has a small amount of old blood that could not be flushed out remaining.Is this dangerous and acceptable?And can the infection really cause delusions?Please can someone give me an opinion on his longterm outcome.I know there`s no crystal ball for this.But I need to know an opinion on other peoples similiar good or bad outcomes. Signed a heartbroken son...