Hey, wow that's a lot of bengals lol.
The main issue I can see happening is with the 3 boys, because they are litter brothers they will already have sorted a pecking order as to who is boss whilst they are little but that can all change and shift around when they all hit sexual maturity. You could end up with some posturing and even fighting. The females should (touch wood) be ok together it's more the boys that could be a worry as I know some people don't like litter mates together and some are fine with it.
Boys and girls together are usually fine, girls together are fine it's just the 3 boys that may cause an issue in the future and major fighting.
The other issue I see in the future is having a lot of bengals at the same age means a lot of vet bills for elderly cats at the same time which could be too much for your family. Have a think if you could afford to have 5/6 cats with kidney disease. Although I do think you could be OK with having a fund for them all that you put into every month just incase which can help you out in the future.
Where are you from? Someone here may have some details of a good rescue place you could give a kitten to as I do personally feel you are better off giving a kitten/cat away or rescue than selling anyway, selling can sometimes give the wrong type of people and as you want the cat to go to a great home try contacting some Bengal rescues in your area who could really help you with vetting and rehoming a cat if the worst happens.
Good luck with all the little ones, I know you want to do what's best for them all and I'm hoping it all goes ok for you.
As for photos as we all want to see your little ones we're suckers for kitten cuteness
Use this post to help
viewtopic.php?f=11&t=21658Or you can upload via the attachments, if you go into the gallery area there are several stickies posts about uploading photos :)