These are questions to ask your lawyer. We don't know the facts.

These are questions for your lawyer....................

Ask your parents..............................................

Your post is missing a lot of facts. I don't know why they are threatening to sue you, but my guess is they won't.

First step is to figure out what is the source of the noise. Could be completely unrelated.

By your own statement you don't have 20 years of marriage so you don't qualify.

Theoretically you can sue for any vet bills, but the cost would likely outweigh any recovery.

You already asked this question. No, IMO it is not solicitation.

If we told you 25% or 75% it would be a guess and useless.

Duplicate question. See prior answers..........