Right front on all of them and my kids and little nieces rock things the same way too.

Rode motorcycles through my 20's and 30's (and will again) and besides being comfortable with the right front, find that having my dominant hand controlling the most important brake on my bicycles makes sense.

Nice that I collect old British bikes so the routing is already done and some tiimes a right hand routing works better with a caliper that has it's cable routing on the left. Only other issue with routing might come from cable guides being a little off.

I find that I have no trouble riding reversed set ups either and did ride my bikes with a North America set up for a long time as well... I keep a few bikes as shop loaners so they have a conventional set up as most people are accustomed to this.