In my extended family there are a couple of cases where two sisters married two brothers. Their children usually end up closer than cousins, more like brothers and sisters. I notice it's always a very warm and close set of relationships.
There is only one problem with that - in case it doesn't work and you two break up, then he's still family and you'll have to keep meeting him whenever there's a family meeting.
i dont think so. that way you know a little more about him. it depends on how you feel about him. good luck.
no, it doesn't matter but things could get a little awkward if you break up, as rotten sheep of evil said.
I would think not, if they are cool with it I see no problems.
No not wrong at all!!! Go for it!!!