How will I tell my mother?

So I have a boyfriend. He’s what people would normally call “talking” but I hate that so much that we just call each other boyfriend and girlfriend even though we haven’t gone on a date yet. Anyway, we’ve been low key for the past week because I don’t want my sister to tell my mother I want to do it myself.

Only question is, how?

My father briefly dated his mother in high school, which is really awkward, and last year I mentioned I was friends with him and my mother freaked out and said his family were awful people.

But I met them, and they’re all really nice. So..? We want to make things official, but I don’t want my parents to freak out.