Is it normal that a dreamt of my great grandmother?

OK, I know the title sounds retarded, but hear me out(or, better yet, READ me out). Apparently, when my mother was pregnant with me, my father took her to see his grandmother(my great grandmother) where she was buried. Some years later, when I was two, I had a weird dream that the three of us went to her grave again to visit. Now, when I was two, I had NO idea who this woman was and my parents hadn't spoken about her until I was about ten. And yet, I still remember having this dream. My grandmother told me that a few of my cousins have seen her ghost, and that she herself has had a few weird dreams about my great grandmother. So now I'm wondering if my dream was something supernatural or not, or if it's just some random dream....