I call my mum by her name a lot, I don't really know why.....I just do? It started a few years ago as a way to annoy her but now it's stuck so oops. But most of the time it's just mum.
I always call my father 'dad' though. It feels weird to call him anything else.
I call my mother "mom." I very rarely speak to my father and it's usually brief text message exchanges so I don't really call him anything. I probably wouldn't call him "dad" if I met up with him today.
I say mum and father, kinda an odd combination but I realized at 13 that I had to stop calling them Mommy and Daddy I rarely have to call them though, if I want to tell them something I just go to them