I agree with Mr. Blumenthal and will add that you should not represent your sister since only a licensed attorney may represent someone other than...

You have no viable legal claims in my opinion.

Obtain a copy of your social security "statement" which will show you your reported earnings since day one. Compare that to your tax returns to...

Probably. Why would you want to do that?

I agree with the prior answer. Your remedy is to file an insurance claim.

Your question is unclear. You may wish to repost.

Your age and disability status are not relevant. Nor do I understand why receiving an email at any given time is a problem. Don't open them until...

Rude and unprofessional but not legally actionable.

Since you are in the UK you should ask this question of local counsel.

As a general rule, a business is not responsible for the criminal acts of others.