Afraid of family dying while at college?

You can worry to your heart's content if you feel so inclined, but it will change nothing. No one will die one second before their time, nor live one second beyond their time whether you're nearby or in Timbuktu. Your parents are not old, and your grandmother is attacking life head-on (as opposed to sitting around contemplating the inevitability of death). You couldn't ask for a better example to follow.