How many children will be affected if one parent has the disorder?

WHAT DISORDER? To get the most out of this information site you need to be follow some basic rules. Within your submission, provide pertinent background information. In this case it would be the name of the disorder. Then ask a clear question, as you have. Since you provided no background, we don't know if your issue is food poisoning, cystic fibrosis, etc. We cannot see your uploads or or prior questions.
It depends. In some inheritable disorders, the risk for each child to inherit them is 50%; in others, 25%. In some, daughters carry the mutant gene & sons are affected with the disorder. Therefore, all children of an affected individual, two carrier parents, or a mom with an X-linked trait, if she has all boys, could inherit a genetic disorder, if all inherit the mutation in a way that causes clinical disease.
Disorder. It depends if the disorder is autosomal or sex linked. Further it depends on if it is autosomal dominant or recessive.