Au Contraire Mon Frère

What do the inverse expressions, m and f, mean? 3

Looks like I know what it means to do something different, but I'm not sure. I don't really know when to use it. Explain and use a phrase or phrases.

My brother on the other hand.

Sen. F.

On the other hand, my friend.

Literally the opposite is true, my brother ...

My F thought it was big, but other than that, my F was shaky.

My brother thought it was the same, but instead my brother was thin.

Au Contraire Mon Frère

Au Contraire Mon Frère

My friend on the other hand ...

On the contrary, my brother

My sister has a habit of poetry.

Au Contraire Mon Frère

Au Contraire Mon Frère

So what do people mean?

Au Contraire Mon Frère