Friend's kid is hyper, his dad has hyperactivity with mild torretes syndrome. Could their child be starting to get it?

Unknown. Attention deficit hyperactivity disorder is something that is usually inherited, therefore if dad has it, it is likely the child may have it. However, each person needs to be evaluated individually. You might suggest to your friend that they take their child to their pediatrician to be evaluated. By the way, most pediatricians evaluate a child for adhd with questionnaires.
Certainly Possible. There is a genetic predisposition to these conditions. To have a proper diagnosis, a visit to the pediatrician would be in order.