The symptoms depend on which part of his brain was affected by the stroke. While Alzheimer's usually begins with memory problems, vascular dementia more often begins with poor judgment or trouble planning, organizing, and making decisions.
Landlords are not responsible for the loss of personal property of a tenant after a fire. This is because the landlord had no control over the fire or over what property the tenants decided to keep in the rental unit.
If you wrongfully take a tenants personal belongings while the tenant is still legally renting from you, you may be liable for damages and your actions may relieve the tenant of liability for unpaid rent or other kinds of claims you might have.