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Hi thank you for your message, please note that I will look to provide an accurate but nevertheless speedy reply to your inquiry. I am sorry to hear about your situation but I will endeavour to help you today.
Is this a private landlord or housing association/local authority?
Ok, unfortunately in that case, he would not have any extra rights by being their for so long. As a private tenant with a private landlord, they can do as they wish with their property including selling it. That said, it is likely it will be sold with him as a sitting tenant, and then the new landlord will hopefully continue with him as the tenant. I trust this assists
Let me know if you have questions
It is a possibility which in essence makes it harder to remove your father but does not prevent the sale, you can read about these here: https://england.shelter.org.uk/housing_advice/private_renting/regulated_tenancies
I trust this assists
No problem, take care.