I have a (half)sister in her mid thirties that I've never met.
A (half)brother and (half)sister (twins) who are...uhm lemme see, 15+18=....33. I used to be really close to them when I was a toddler, they were always baby-sitting me. My sister's boyfriend dislocated my elbow once..my brother threw me off a cliff when we lived in Washington (it's how I learned to swim) and endangered my young life in many other ways. I haven't seen either of them in person since I was 4 but my brother has always kept in touch and when my sister had her son we got closer again.
I also have a (half)sister who is turning 26 next week. I haven't seen hide nor hair of her since I was 10. She was quite standoff-ish when we were younger. And she also dislocated my arm when I was a toddler.
Then I have my favorite of the older siblings, a sister who is 23. We would have been close but she grew up in Washington with our dad while I lived in Texas with our mom. But we call and text each other almost every day and are really alike. She pushed me down a hill into traffic when I was three. I think in my family the more danger someone has put your life in the closer you are once you've healed.
I am 18 and fairly boring
and then the sibling I'm closest to overall is my little sister who is turning 15 this year. We used to HATE each other. But once she turned about 11 or so and realized she was in fact, a girl, we've gotten a long a lot better. I got her to stop listening to rap around me and she reads the same stuff as me. We pretty much tell each other everything. She used me as a teething ring...and when she had ear infections (up til she was 12 and had surgery for an inner ear inalaance) i would let her gnaw on my wrist. She also used to beat me and my friends in the head with dolls. Seriously, my school would send CPS people to my house only to find my bruises and scars were from my little sister not my mom. I used to tie her up, try to suffocate her, duct tape her in my closet, sit on her head with pillows, leave her crib bars down....but she just would not die. Good thing, too. cuz if she had I wouldn't have my best friend
Like I said, the more someone puts your life in danger the more you love them!
EDIT: About the looking alike thing. My younger sister and I have very similar eyes, but completely differen't bone structure, facial shape, complexion, an dhair texture. But everywhere I go that she frequents someone will say "Are you Mari's sister?". I lactually look the most like the 25-year-old. And then My littles sister and older (whole) sister look a lot alike. But I laso look like the older one....someone once asked if we were triplets...considering the fact that at the time we were 21, 17, and 12 none of us took it as a compliment