How should you handle an elderly relative who won't take good advice about his health?

My elderly father fell on Friday night and hasn’t been able to walk since. He has also vomited during two successive nights. He had people coming to his 80th birthday party and didn’t want to let them down.

My brothers and I urged him to call an ambulance or visit the nearest hospital. He insisted on being driven to the hospital nearest his home. He turned away an ambulance my brother called for him and is on his way to the hospital.