As long as you are all on one booking, you get 2x32kg luggage allowance each, so 6 bags total. The golf luggage can be part of your standard allowance as long as it is smaller than 190 x 75 x 65cm.
(https://www.britishairways.com/en-gb...orts-equipment and https://www.britishairways.com/en-gb...age-allowances)