Is there any kind of legal action I can take

You may have a case. It could be a matter for small claims court. A local lawyer can advise.

My question is it possible to test for k2/spice? Does the DA have a case? And could we file for a wrongful death lawsuit?

If the DA prosecutes, you can talk to the prosecutor about restitution, if that is available in your state. Definitely talk to a local injury...

Can I continue to reside in the home in. the event of her death under a hardship or will the home be seized ?

More information is needed to advise. A local elder law lawyer can assist.

Was it illegal to sign a franchise agreement with me because of my situation?

More information is needed and the franchise agreements and disclosures should be reviewed.

With a case of that size and complexity, you should be represented by a lawyer.

How soon can you start up a 506 Reg D offering after stopping it.?

Securities laws are complicated, and the consequences of doing things wrong can be devastating. Hire a securities lawyer.

Should we seek counseling? What should we expect from Target?

It sounds like your wife got hurt. You should definitely consult with an injury lawyer. Most injury lawyers offer free consultations and work...

I wandered if I can sue the manufacturer or the doctor ?

It could be one or the other or both. More info is needed to advise. Talk to a local injury lawyer (or lawyers) who handled medical malpractice...

What is the standard percentage?

That's a business / financial decision and not a legal one, and, even at that, much more info would be needed about value added, costs involved, %...

You can try google for navien lawsuits or lawyers and/or talk to a local defective products lawyer.