My family name will probably disappear after my generation, unless my youngest brother and his wife have any kids in the future. That's their business, however, I won't even ask them about it. I, an involuntary childless person, know what it might be like to be asked that question constantly.
What is this about a bride and her special day? Firstly; oughtn't the day to be special for the groom as well? Secondly; it's the marriage that ought to be special, stupid, not just one measly day.
Aren't there quite a number of different tribes of Native Americans? It might not be the Cherokees that have arranged marriages. That's as stupid as saying Europeans have blond hair.
If your grandson is adult, you can't force him into a contract without his consent. If he's not an adult, he's not allowed to enter into a contract. You have to move to a country with little or no human rights, and somehow get him to move with you. Best of luck with that!