Update!(this will be a long one oh boy)
so mum called me downstairs to the basement(it's a little hangout area for my parents) and she asked about what I meant by going by he/she/they because she was a little confused. I told her that I can go by he/him, she/her, or they/them. You know something? She was okay with it. And I told her about my second name, and apparently she actually wanted that to be my name before I was born, but my birth father (who is trans and now goes by Sarah, and I've never met her) wouldn't let my mum. She said she is totally fine with it, and supports me. She told me she's gonna talk to dad tonight about this, and she would like me to talk to him about this. His side of the family is really stubborn, and they probably won't be okay with my Sexualities and gender identities, all they have to know is that I like girls and boys. My dad will still probably be okay with it, but he might just have a little more trouble dealing with it. So, it went well overall! She's also okay with me being Grey-Aroace! :D