I could have written this two weeks ago as we have also always had our connecting room request guaranteed....until last week! We did a split stay at the BC and Poly, had two rooms booked at each, and were traveling with our three boys (12, 15, 17). We got connecting at Poly but not at the BC...we were in 3714 and they were in 3721. They are old enough so it wasn't an issue and we had spare keys made up, but for kids your ages, I wouldn't risk it!