Is it the custom in any other country besides America to address your parents as ma’am and sir?

To be clear, as far as I know this is only done in the American South, and possibly in some military families. Even among those two groups just named, it’s not done in all families. It’s usually used when responding to the parent, otherwise mom and dad are used.

I recently asked my husband if in Mexico he knew anyone who addressed their parents in such a formal manner, and his response was absolutely not, and his tone implied the same response I had when I first heard a peer of mine use it, that it was very odd, and almost upsetting. I’m less upset by it now, I realize it’s just a custom,

Obviously, if your country is not English speaking then it would be the equivalent in whatever language is used.