My mom died from breast cancer when I was young, young enough to where I don't remember her at all. Even if I just see a mother in daughter together, it sometimes brings tears to my eyes, because I know that is something that I will never experience, and don't remember the feeling of. If you still have your mother, be thankful for that. If you don't have a good relationship, fix that, because you never know if you'll never see her again.