I got one too. My husband's mother has the same birthday as my father, his sister has the same birthday as my brother, his niece has the same birthday as my niece, another of his niece's has a birthday the day before another of my nieces. His nephew has the same birthday as our daughter. One of his uncles went to school with my mother which was not know until the wedding.
My supervisor at work has the same birthday as I have and while talking about that it was discovered that we grew up in the same neighborhood, blocks from each other. Our first names are the same with the last name being different only by the last letter. WE now live in the same county and we both have a son with the same name. We went to the same high school but at different times and did not know each other until this job.