I second Stu. Two years ago there way a terrible accident resulting in 2 persons drowning in San Diego when 9 were on board a McGregor for a daysail. That being said, I have a 34 and every year I have a "family outing". This Friday there will be 10 of us on my boat, all adults except a 13 years old teenager. Of course pfd's for everyone. The program is short and simple since I am the only one with experience: we will sail for about 1 to 1 1/2 hour (conditions permitting in view of lack of experience of visitors), then drop the hook in a shallow bay where they all can go for a swim while I watch like a hawk and keep counting the heads. Nice leasurely lunch while they enjoy the sun, then Mid to late afternoon we sail back to my club, again based on weather conditions. At the end of the day, the family goes aways happy taling about "next year" and while also happy I'm tired for the stress. Big caveat here: I am on a lake and help is a short distance away. Would I do it when I sail on the ocean, even a coastal passage ? No, I would not take that chance. To quote Stu, Your boat, your choice, but the smart move is not to do it.