Why Are Pastors & Their Wives Called “Daddy” & “Mummy”?

Apparently, I am also guilty of this act.
Though I call my Pastor “Pastor”….But I don’t call his
wife “Mummy Pastor”…..I call her “Mummy”…and I have
no idea why…It’s just like that.
So, someone is asking…Why do you call your pastor
“Daddy”…and his wife “Mummy”?
After an argument in church resulting from “call me
mommy and I am older than you”, I have been having
this curiosity, why are pastors now called “Daddy” and
their wives “mummy?” personally, I do not believe that it
is right to address a pastor as “Daddy”. Like pastor is
not enough respect to someone who teaches the Bible?
Jesus was called “Teacher” and not Daddy. Is there any
bible verse to wrong my thought or are we now
adopting our own style of Christianity? And why would a
pastor even accept such a title when our father in
heaven is also addressed as such?
Any reasonable answers?