I would find it very odd if I were to be introduced to the family prior to the first date. I don't want to meet family members unless I know there is something between the two of us. I would hate to disappoint the family and make them think that I am hurting their child, if it didn't work out. It's an uncomfortable situation as it is, so it would be even more uncomfortable meeting the family on the first try. I wouldn't even know what to say, other than hello and how are you. If someone asked me to meet their family on a first date, I would more than likely avoid it like the plague.