I would not conclude an email vs a letter means the content is not legitimate. I suggest you hire an Internet lawyer to review your situation with.

After all these years I doubt that anything will come back to haunt him. If they do he will need to get legal representation.

I am changing your practice area to Ethics & Professional Responsibility Law in hopes you get some good answers from lawyers in that field.

Speak to any local attorney about filing a restraining order against the person who is breaking in. They should be able to help you.

I am changing your practice area to Landlord & Tenant Law in hopes you get some good answers from lawyers in that field.

I am changing your practice area to Child Custody Law in hopes you get some good answers from lawyers in that field.

This is a scam. They will never pay you anything, just keep asking you for more money, which you will not send!

I am changing your practice area to Employment & Labor Law in hopes you get some good answers from lawyers in that field.

You will want to discuss your situation with an Internet lawyer in more detail. Many lawyers on Avvo offer a free phone consultation.

I am changing your practice area to Criminal Defense Law in hopes you get some good answers from lawyers in that field.