Don't take this the wrong way...I love my kids and I love my friend's kids, but 9 kids and 6 adults on a 23' boat is going to be brutal! Fortunately, all of my friends with kids have their own boats, we may take all the girls one day and have 4-5 girls on our boat and then the next day we might take the boys, some days our kids are on the other boats and we are adults only on ours. Your surf or wakeboarding rotation with that many people will literally take all day. Honestly, that is way too many kids and people in 1 boat in my opinion no matter how well they all get along. You are gonna need a Xanex prescription or maybe you are in a state where marijuana is legal and that would help.