Who should sit at the top table if the bridal party have all got partners?

My bridal party is made up of several friends, my sister, my finance's sister, and also his brother. Everyone has their individual partners, who are invited to the wedding. Some are being stubborn and want to sit with their partners, but that'll make my top table huge. But if they sit at other tables with their partners, my top table will suddenly have nobody. Are there ways around this? I don't really want to sit alone, but having a huge top table doesn't really sit well with me.