It doesn't look like the original question about cruising with 3 boys was answered.
My suggestion, try it and see if you can make it work. It worked well for us. We also met another boat with 3 girls this season. I'd say that in both cases there were great things as well as challenges. Each family is different. The stories of the Copelands' circumnavigation (Liza & Andy Copeland - Cruising Authors
) gave us the courage to give it a try. And it worked! Let me know if you want to know more or have any other questions.