AITAH for calling my "dad" by his first name and picking my step dad over him

My dad is Kion, who helped make me, and my stepdad (dad)- is William (I’m using their middle names).

When I was born Kion wasn’t really there for my mom at all. He barely showed up. He wasn’t there when I was born and he missed my first and second birthdays. and barley showed to my others

My mom and William got together when I was 4 and ever since then he’s been there for everything. William has three other kids who are my siblings and we basically became a family. He threw me a huge 5th birthday party picked me up after my first day of kindergarten dropped me off and even learned how to do my hair (I have type curly/kinky hair). He treated me like his daughter and has always been there for me. Kion hasn’t. he even planning my sweet sixteen

But my mom still wants me to stay close to his side of the family because she says I need to be around more people like me (Black) and because she white she thinks it better and she disent want to keep them frim me because my dad. So I go over to my grandma’s house every other weekend.

I’ve called William dad since I was 5 because my siblings did, but when I go over there, I’m not allowed to call him that or even really talk about him. Me and my aunt got into an argument because I called Kion Kion to her face. She got mad and said I was being disrespectful and she said William isn’t my real dad. I told her he’s more of a dad than Kion is which just made things worse.

I know I don’t always know when to stay quiet and just push thing but after she got really mad and it basically ruined my whole weekend. She even called Kion to talk to me like it was going to change anything. and telling him what I had said

I just don’t see him as my dad but that side of the family has a big problem with me calling him Kion. and think i am wrong i am F15