^^^^x2^^^^
I strongly that you consider the Yukon XL model versus the standard size Yukon. I've owned both, and I had 2 boys and 2 dogs. We found the standard size Yukon to be limiting in available space on long trips, particularly on long trips where taking gear is necessary, such as camping.
Regarding 3 kids sitting shoulder to shoulder on long trips, that did not work out so well for us with only 2 kids. They would start by one teasing the other and escalate from there into near total pandemonium. Maybe, we were different, but I don't think so, as me and my sister were the same when we were young. The only difference back then was that when we acted up, my father's arm was long enough to reach us from his driver's seat.
You can also store gear between the captains chairs, when needed. I have my subwoofer located between the captains chairs, but I could stow gear on top of it, if necessary.