Let's say I have two tables that look like this:

TH   TH   TH   TH  
TD   TD   TD   TD  
TD   TD   TD   TD  

and

TH   TH   TH   TH  
TH   TD   TD   TD  
TH   TD   TD   TD  

I'd like to select the 3rd column in each.

At first I was using nth-child as such:

$('table tr td:nth-child(3)')

But that's not going to work, as 3rd TD is in a different column in each table.

What I need in pseudo code is 'get the 3rd TD or TH in each row'.

I assume I need to use $.siblings but not entirely sure.