I have two words for you "common sense." Remember when you do an event you are "PERSONALLY" responsible for everyone that attends. Bottom line, you know your people and you understand how they act. Some event for example an early Kid party is the exception. Event that evolve teens or adults consuming alcohol should have security to minimize your personal responsibility. I know you love your family and have their best interest in mind, so please do what you can to protect them even if you are protecting them from themselves. You that uncle that looses it when he has too much. If he hurts a non family member you can have a law suit on your hand. Thanks for reading and enjoy your events and be safe.