Half-sis, my girl

My mom married a guy with 2 daughters when I was 5. <br><br>She's my only sibling but it's a little strange because she had 2 half siblings.<br><br>My only sibling is 4 years older than me. She has 2 half sisters that are much older than her. It's weird to think about but I guess they are my "half nieces". Something like that.<br><br>Edit: Wow, I got 2 awards today. They are the first of my life and I'm only 23. Thank you so much, kind stranger. I might cry if I was sober.