What a polite way to tell someone…

Say it like that.

It's clear. Concise. To the point. And they can't say you were rude in your response.

do we need to be polite? 🤔

this is an A-B conversation.. C your way out of it!

"This business doesn't belong to you"
"Businesses these days are hard to continue"
"This Business is more than you can afford"
"What is your business like?"

thats a private issue thank you

I have adopted children. I lost count of the number of people who asked really personal stuff in front of the kids like "where are their 'real' parents?" I used to deal with it by making a joke. I'd say something like "I was 'real' enough when I was 'really' cleaning up their puke at 5am during that sickness bug"

Just smirk

just like that or "wouldn't you like to know?"

or you can just ignore the question and ask them an also very invasive question in return

it's private matter/family matter, etc

that's none of your concern

I always say, "why do you ask?".... or "who wants to know and why?".

Just change the subject

I'm sorry, I am not going to talk about this.

That's not something I care to discuss.