Almost 90% of patients have an affected parent but the symptoms in the parent can be quite different from those in the child.

Asynchronous bilateral disease occurs most frequently in patients with affected parents.

Although such people most likely do not have an affected parent, they can pass the genetic change to their children.

In some cases, an affected person inherits the mutation from one affected parent.

Each child of an affected parent has a 50 percent chance of getting the disease.

In the hereditary group, each child born to an affected parent has a 50-50 chance of developing the disease.

Each child born to an affected parent has an even chance of developing Marfan's.

About half of those diagnosed with the disease have an affected parent, so genetic counseling is recommended.

Children of an affected parent have a 50-50 chance of inheriting the disorder.

If there is one affected parent, each child usually has a 1-in-2 chance of inheriting a defective gene.