My two siblings and I are all born in the same month. My parent's wedding anniversary and my mom's birthday are nine months prior... either someone liked their gift or someone forgot to get one or... some questions are best left both unasked and unanswered!!!
That's pretty cool. My brother's second wife had a son when they married who has the same birthday as me. And after my divorce before I married my husband, one of the guys I dated from the on-line site shared a birthday with me -- same year and even the same hour of birth. That was weird.
LOL - sounds like a special anniversary happened nine months earlier! I have the same birthday as my best friend and my grandmother. Makes it easy to remember!