An Accent

My great grandmother emigrated from Sweden and settled in Minnesota. She met and married a farmer, who became my great grandfather. They had a son and a daughter. Their daughter became ill and died on the way to Michigan. My grandparents had three children, two sons and a daughter. One of their sons is my father. Of course my father talked about Grandma Klara from Sweden. And supposedly, my sister has my great grandma's nose and blond hair. Two or so years ago, the head of a home care agency came to the house, and almost immediately asked if my family was from Minnesota and Swedish because of a perceived accent. Imagine my surprise, as this was the first time ever that anyone had said that I have an accent (other than a Midwest accent). I thought it was a one-time occurrence, so was surprised when it happened three more times. I was reading online to try to identify what in my speech patterns cues a person that I am Swedish. No luck to date, except to discover that someone in the western part of the US was shocked to find the same thing happen to him! I am fourth generation Swedish, do not speak the language.