I don’t know if this is an easy question to answer. My mom was the same and so was most of my family on her side. Though her hair was a lighter brown than mine. My dad has black hair and has always had black hair. I was probably around 9 or 10 when my hair could stop being considered blonde to any capacity. I am mostly northwestern European but I do have a bit of southern European as well. If you need any more information I am willing to give it.