His father, Nick Savalas did. It was a Greek one of course. The restaurant, that is.
Yes, you can serve in your own restaurant.
No. The restaurant was only in business for a year before it went bankrupt
100% if you want to own a restaurant. Build it and they will come.
So far, No.
You have to take at least 5 years to own your restaurant.
You cannot own a restaurant in animal crossing. There isn't even a restaurant in animal crossing, so you cannot even get one. You can't own a restaurant because animal crossing is about taking care of your town, not owning a business.
If you are interested in finding out how to open your own restaurant it helps to talk to those actually running successful restaurant businesses.
It is a place where the restaurant it self provide you with kitchenette to prepare meal on your own.