What can cause confusion in an elderly patient?

Amother & father presents to the pediatrician office with their son (aged 10). on a screening test at school her son was diagnosed with color-blindness. she and her husband are not color blind. they have two other children (12 & 7), they are not color blind. the mother is the 3rd of 4 (3 girls 1boys) children, her oldest sibling is male, he is also color blind. on questioning her family, her sister that is younger than her has a 3 year old boy that is also color blind. a. draw the pedigree of the trait