My mother has light blue eyes, my father has light hazel eyes. My brother and I have dark brown eyes. VERY dark brown. According to some "is he your daddy" thing I read, my father could NOT be my father. Well, this is just one of those things you KNOW. Trust me, he IS my father. Somewhere there are brown eyes. Only one of my children has brown eyes, one has blue, one has very light (closer to green) hazel. None of my brother's children have brown. My blue eyed son could marry a blue eyed woman and have brown eyed children.
Don't panic, I am sure your parents are your parents.