Lol, I have noticed I refer to myself in the third person to Spock, but then struggle when finishing a sentence and sometimes I do both 1st and 3rd in one! So I'm trying to just use 1st...but it's hard!! I'll say something like "mummy is busy, I will get one for you in a minute" so I need to stop saying mummy....it was good when she was younger to learn who I was, but now she knows I'm mum...and I'm just confusing myself and therefore her
I do the same, mixing things up.

It's not something I've ever really thought about, I just do it. I suppose just saying "I" makes the statement seem... Harsher? More authoritative? Calling myself "mummy" or DH "daddy" softens it a bit until I can get to the rest of the sentence