What specific criminal laws are you suggesting were broken?
Obviously a lot of crap happened here but there's not a legal obligation to be helpful to next-of-kin. Suing for vague "damages" is going to be far more productive.
Taking her remains without the knowledge and consent of her next of kin is surely illegal. If I put a corpse in a warehouse for a year while the family was begging me to tell them where their loved one was, I would expect to face criminal negligence charges at the least.
Obviously a lot of crap happened here but there's not a legal obligation to be helpful to next-of-kin. Suing for vague "damages" is going to be far more productive.