If your objective is to obtain discoverable case information and documents rather than simply punish defendant , then you should get all of your discovery requests including interrogatories out there. If necessary, the court at a preliminary conference can later deal with any unresolved discovery disputes down the road.
Confer with your boyfriend's defense attorney regarding sentencing guidelines, the facts and circumstances of his case, and communications to the court. Otherwise, your statement to the court--while well-meaning--may not be considered.
Generally the answer to both questions is yes. Are you representing yourself here without counsel? If so, you would likely benefit by having your own experienced trial attorney advocate for you to the judge. One goal would be to limit surprises, set reasonable limits on pre-trial discovery and otherwise seek to rein in defense counsel with a pretrial scheduling order fair to all parties.
Whether the correct party can now be substituted depends on notice, fairness and the relative prejudice to the parties. The court's ruling will be based upon a mixed question of law and fact. It can go either way. Engage an experienced NY trial lawyer to advocate on your behalf.
Your parents should start by getting an opinion from the replacement lawyer or an independent bankruptcy professional. This should be done in a confidential office setting. If they wish to pursue an action they must act immediately to investigate and preserve their rights, if any, under applicable filing deadlines.
The question you ask is an important one. In most cases you will benefit from a lawyer (and an experienced accountant). Much depends on the terms set forth in your written shareholder's agreement. In a closely held corporation like yours, values are hard to come by as the stock is neither listed not traded on a public exchange. A fair value for the 15% of the shares needs to be established, along with reasonable restrictions on further sale or conveyance of the closely held stock. These issues...
Hire an experienced business lawyer with securities law expertise to review your proposed plan as well as the company's existing documents. Speak to the company's accountant as well. You should not do this on your own even with the best of intentions.