Onur baggage allowance

Hi all, we are flying out of Gatwick with Onur to Dalaman. I know the baggage allowance on Onur is 20kg each and that any thing over 32kg may be refused. There are 4 of us travelling so in total an allowance of 80kg, and we normally take 2 large suitcases and one smaller one. The larger ones always weigh well over 20 kg but less than 32kg and the smaller one is normally less than or just above 20kg. Individualy the larger ones are over weight but collectively all 3 weigh less than our allowence of 80kg. On previous flights with other airlines they have always taken the weight as a total for all 4 of us, but do Onur allow this, and whats more will they allow it flying back home. 
