I sorta do. I have two siblings and I only share a father with one of them. My oldest sister wasn't my fathers. I never knew what a half sibling was until I was 18, seriously. My sister was my sister and that was it. I had mentioned to someone that my sister was going to visit her dad and they said, "oh I didn't know x was your half sister". I was like "what, she is my sister what are you talking about half sister". I associated half with being a step sister I later realized. I called my mom and ask her what was a half sister. She explained and I said, "well that is stupid, why go through all that, she is my sister". There was no talking half in our family, our parents were our parents, our grandparents were our grandparents all around. I never realized I had more grandparents then most folks until after age 18 when it was all worked out.