You HAVE a corporate attorney. You need your own personal lawyer.
It does sound like you have some sort of case here, obviously a lawyer would be the best person to talk to. A thought I had though, perhaps you could ask the current owner of the original restaurants in Japan (your dad or whoever it is now) to send a letter to him disallowing the use of the name? That might be something worth looking into.
I am a business owner in California with a problem: my co-owner/ex-husband. The original restaurants were started in Japan by my father, whom generously allowed us to franchise it to the US even though my husband was not qualified to start one. I am the president of the company while he is the VP. We each have half of the shares of the business. I do the accounting for the business; he orders things and delivers them to the restaurant.
Now fast forward 20+ years, he leaves me and our four children for an employee. He petitions for a divorce, all we have to do left is separate the properties (aka sell them). Yet he constantly demands money even though our paychecks are the same, except I have four other mouths to feed. When I refuse, he then takes the cash from the business which now happens daily. I have tried many measures to stop him, to no avail.
Two years later, the dilemma continues, except worse. I am trying to buy his share but he plays dirty. He told my daughter that he has potential buyers but I would be the first person he wants to sell it to, yet he refuses to meet with me or our corporate attorney (who had no idea my ex-husband had any intent of selling his shares). Recently, I found out that he is opening another restaurant with the same name without my approval even though I am the president of the company and an equal share holder. Our corporate attorney knows nothing of this.
Is there any way that I can get rid of him or punish him legally?