We all family. Even if we don't claim them we have a family. Alive or dead they are family.
But when it comes to someone who is always there for you but they have no family ties to you. Do you consider them family?
Do you consider your best friend to be your sister? If you do that is awesome because we all deserve someone who is close enough to be called family.
My best friends are my best friends but my best friend that knows me the best she is one I call sister. We are not blood-related but it feels like it when we hang out because we steal each other's clothes. Know each other's limits and can tell when we are upset.
You don't have to be blood to be family. Because sometimes the blood can get diluted and you don't want to claim that person or that family. Maybe it's a bad situation. There are many reasons that are okay to not claim family. As long as you have your best friend you are good. You know they won't turn on you.
Don't let people say "well that is your dad" or "but wait they aren't your real family" people will say that without knowing the situation and it does get old. But just tell them no this is my family we don't look alike but we act alike.
Friends are family and all always be family.