I understand your concern about reoccurance of stroke in your father in law.
High blood pressure, Diabetes,
high cholesterol, Smoking, alcohol and physical inactivity are the risk factors for recurrence of stroke which can be modified.
See that he continues to take antihypertensives and Aspirin (which is a blood thinner which helps to prevent stroke) and continue using
antidiabetic medications/insulin and check blood glucose levels along with HbA1c regularly. Use statins for high cholesterol.
Life style modification: Cessation of smoking and alcohol would reduce his chance of recurrence of stroke. See that he moves his limbs for some time daily (even if bed ridden) , physical inactivity helps in blood circulation.
Continue
Physiotherapy for his weakness,
speech therapy if he has any difficulty speaking.
Follow up with HbA1c, serum triglycerides, cholesterol levels every 1 month.
Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions.
Wishing your father in law a very good health!