The problem with civil cases is the burden for proof is far far lower than criminally. That’s why all the BLM, anti cop folks want qualified immunity removed because then regardless of what criminal charges victims’ families can sue cops without the burden of proof.
If the lawyer did in fact forward the evidence to the DA and law enforcement and wants a grand jury convened then there has to be some real damning evidence against him
Grand juries don't exist in civil cases. He must want it to be a criminal action.