Relatives vs. Family

Unfortunately, not all those related by blood are necessarily close for whatever reason, even those whose blood ties are quite proximate (siblings, parents, children, first cousins, etc). The people who really matter in our lives are those who are loyal to us, and to whom we are equally loyal. Think of the people who you would drop everything to go help in a crisis, no questions asked; whoever you just thought of? THEY are your family. 

Being related doesn't mean you can't also be family. It just means that it isn't a sure thing.