Hello
Welcome to health care magic.
It seems that your father had an episode of Transient ischaemic attack or ministroke.
I advice you to get his CT scan head,blood pressure measurement,blood glucose,ECG and
blood lipids done.This will rule out any brain pathology,
diabetes mellitus,
heart disease,
hypertension if not already diagnosed since they are risk factors foer stroke.
Has he been on any medications?
Has he been into chronic habit os smoking or alcohol intake?
TIA can lead to a full blown stroke.
Low dose
aspirin needs to be started on maientance dose for prevention of stroke.
Other medical condition needs to be brought under control.
You need to meet neurologist/internal medicine specialist for all these things.
Lifestyle changes like healthy diet,avoiding smoking or alcohol need to be resorted to.
Hope I answered your query.
Wish him good health.