It’s always really weird to me when an adult uses the term ‘Daddy’ to refer to their father. (Dad is fine, but ‘daddy ‘ sounds like you’re an infant.)
@octothorpe when I got engaged at 23, my grandfather sat me down to give me some advice. One piece was: address your wife’s parents the same way she does.
So.
She was 21 and still addressed them as mommy and daddy.
So.
Today I’m 46 and I still address them as mommy and daddy.
It may be a little hokey but honestly I think it has actually helped them feel closer with me.