Ah I see now.

Because your court order specifies an ending time and day for his two week parenting time, my interpretation would be that if he takes the kids from the 15th through the 29th, then no, he would not additionally get the weekend of the 29-31st. However, in the spirit of "every other weekend", he would get the children on the weekend of Aug 6th and every other weekend after that.

But I'm not a lawyer.

However, I am a CP who has gone through similar situations and debates, and my non-legal advice is that you have two options: you could stick to the letter of your court order which says that you would get the children back at 6pm on the 29th (and he would then get the kids on Aug 6th) or you could give him the weekend of the 29th for the sake of consistency and cooperation. The underlying question that you have to decide is is this really worth arguing about?