The chances of having
HuntingtonsHuntington's disease Disease are extremely low if there is no
familyBirth control and family planning
Choosing a primary care provider
Ewing’s sarcoma
Family troubles - resources history of the disease, this would require a spontaneous mutation in your own DNA which probably occurrs in one in millions of cases, exact figures are not availavble since the incidence is so rare.
The only possible way a parent would not know about having the disease would be if the parent died in young adulthood from another cause before the disease had manifest itself but after children had been concieved.
The speed of getting a result back will depend on the individual laboratory, for this type of test 4-6 weeks would not be unusual.