Sibling Relationship

My dad passed away 5 years ago, and I have not talked to my siblings since the funeral and it bothers me so much. I have tried reaching out apologizing for any wrongdoing and they just ignore it. My brother is having a baby I didn’t know, I had to learn through family members. My sister refers to other people as her sisters and I just watch their lives unfold on Facebook. I really want to block them and go on. I

mean it’s been 5 years no response and it seems like they don’t consider me a sister. I’m mot sure if it’s because we have different moms or what? Do you think removing them from social media will stir the pot or will they not care.