Answer:
Juan's statement is not necessarily correct, and it is not a reliable way to determine the inheritance of eye color. The inheritance of eye color is a complex trait that is determined by multiple genes, and it is not always predictable based on the eye color of an individual's parents or other relatives.
It is possible that Tasha inherited her brown eyes from a grandparent or great-grandparent, or from a more distant ancestor. It is also possible that Tasha's parents carried genes for brown eyes, even though they themselves have green eyes, and that these genes were passed on to Tasha. Alternatively, Tasha may have acquired her eye color due to a random genetic mutation.
Therefore, while it is true that genetics plays a role in determining eye color, it is not accurate to make assumptions about an individual's eye color based solely on the eye color of their parents or other relatives.