Lesson+1+Smith+Family+Background

The first step in our case study is to learn about the family. Here is what you need to know at this point:

Mrs. Smith is 32 years old. She does not exhibit the hemophilia trait, but her side of the family does have a history of the disorder. Mrs. Smith's brother has hemophilia. Mrs. Smith's maternal grandfather has hemophilia. Mr. Smith is 34 years old. Mr. Smith does not exhibit the trait and there is no family history of the disorder. The Smiths have three children, one daughter and two sons. Of the three children, only one of the son's has hemophilia.