Half-siblings... it's complicated

I would like to chime in here as an adult who has "been there, done that". I was not adopted, but due to divorce/remarriages in my family I have a combination of full-siblings, half-siblings, and step-siblings some that I was raised with and some not. I was raised by my mother and for awhile it was just me and my full-brother. Later, my mom remarried and I inherited two step-sisters (who lived with us) and a few years later two half-brothers were born. These five kids I consider to be my siblings - no half or step modifier needed. I also have 4 half-siblings on my father's side. The oldest two, I had a relationship with during the two years that I had visitation with my father every few months. The youngest two were born after my father dropped out of the picture and we have never met. I can remember what it felt like to go to my father's house and be told these were my siblings, only to then leave and not see them again until the next visitation, which was often several months away. I hated it! It felt phony! I felt like I was supposed to feel something for them that I didn't feel. I really didn't miss it at all when they dropped out of my life along with my father. Based on these experiences, I am a strong believer that too much emphasis is placed on biology when it's the bonds that we build that really count. I love my step-father and step-sisters as if they were my own flesh and blood. I feel nothing for my father and his children. Whose DNA we all carry really doesn't matter.