If you absolutely positively have to travel together as a group then you should also consider the priority reward available to Gold members and using a GUF2 if your husband has earned or can earn one before your departure.

If you have loads of Avios then the priority reward should be considered. It enables you to "book any available seat in any cabin, provided there are commercial seats available for sale on any flight for double the standard redemption mileage rate. Priority Reward bookings can only be made offline, more than 30 days in advance and are open to BA mainline flights only."

The GUF2 allows "the upgrade of the member and one person to the next cabin for a return trip on any BA flight number including franchise flights but excluding code-shares. Unlike an MFU, a Gold upgrade can be used on any revenue ticket (even deep discounted Y). If redeeming your GUF2 via BA award-booking classes are used, with a consequent lack of availability. However, if you are booking through a Travel Agent they will be able to use the easier-to-find revenue buckets (they do not have access to the award redemption buckets)."

So if you are able to grab two regular redemption seats you could use one of these to find two additional seats from revenue fare buckets.