You can tell that most of my cousins and I are related. We have similar features.

We have family in Italy, and I grew up a a penpals with one of my cousins there. Now we keep in touch with Facebook. She's a year or two older than me and looks exactly like my sister, who is 10 years younger than her. So close that if I scroll past a picture, I assume it's my sister and am shocked to see it's not!

Do you look like your extended family?