I have a half sister, younger than me by 14 years. The step dad that raised me, and the dad that raised her, are tow completely different people. I call him by name, and she calls him dad, cause well, he is her dad. She told me one night, that I was being disrespectful, by calling him by his name, that I have called him for 40 years, and that I should call him dad. I told her, that my relationship with him has nothing to do with her, and what I call him has even less to do with her.
She wouldnt stop, and so I finally told her, "well, we had completely different childhoods, and raising. I dont bring it up, but if you want to keep pressing the issue, ok. I hated your dad for most of my life, and he hated me. You need to take all these thoughts about what you think you know, and get them the fuck out of your head, and never bring this shit up to me again. Never."
We didnt talk for a long time, and she still wont get over it, probably 3 years now. But she is a spoiled little brat, and was basically raised like an only child. She has no idea what it was like for me.