There's a reason everyone has that one special friend that gets the label 'best'. Good friends are great, and great friends are hard to come by, but having someone to call your best friend is truly a blessing. It is a relationship that goes beyond the boundaries of a typical friendship. It is someone you feel completely yourself around, so much so that they have begun to feel like family.

And, speaking of family, some best friend relationships don't merely exist between two individuals. If you're lucky enough to find someone you click with so easily, you may just find yourself as a part of their family... literally.

The signs are all there! You know you're a part of your best friend's family when:

1. Knocking is never necessary.

When you enter each other's homes, as long as the front door is open, you just let yourself in. Knocking is just an inconvenience.

2. You never grocery shop alone.

Whether it's with your best friend, their siblings, or even their parents, you always somehow have a buddy when picking out food for the week. (Which is helpful because you'll be at each other's houses so much, you better hope you pick out food you both like.)

3. If you have no food at your own home, theirs is always available.

Out of vegetable oil? Run to your best friend's home quickly to get some. No lunch in the fridge? Run to your best friend's home to see what they have. No dinner plans? Run to your best friend's home.

4. You are always invited to stay for dinner.

When you're at your best friend's house around dinner time, their parents don't even bother asking if you're staying... or what you want, for that matter, because they already know!

5. You are also always invited to family parties.

It's basically a given that when your best friend mentions a family party, you're welcome too. And, thankfully, you already know most of the family anyways!

6. You are no strangers to carpooling.

You're lucky enough to have a best friend whose family is willing to be your chauffeur from time to time, especially when you really need it.

7. Two words: family vacations.

Your best friend's family is going on a trip? You're going on a trip.

8. "Are you guys related?"

Everyone always asks.

9. You never need to make extravagant plans.

You're completely fine going over to their house and just sitting on their couch, binge watching television all day.

10. You go over to their house... even when they're not actually home.

...because their family is yours too and you love hanging out with them just as much.