Thought the Dr. was his uncle? Going back to the earlier part, they call those around their parents age Uncle and Aunt, it's common. It's more so for those they are "close" with in ties. If it's someone they don't know, it's usually Mister or the female equivalent, as we have to damn many for a woman depending on their marital status. Besides, the two families are against each other; if they were related they would be trying to consume the other company and not be fighting to be on top and to out preform the other.
Here in the Philippines (Asia), we call out family uncle (Tito) or auntie (Tita), sometimes granny (La) or grandpa (Lo) and sometimes mom (Nay) or dad (Tay). We also call strangers like that as a way to show respect. We also call older males (stranger or not, kuya or older brother) and older females (ate, pronounce it as Ah-teh). We only call people by their names if they allow us to or if we are at the same age or they are younger.

So they kissen cousins ? Also do that count if transmigrated?