(2) There are usually children at a family reunion. Any professional magician will tell you that children are extremely hard to fool. Most magic tricks are based on misdirected attention and sidestepping expectations. Children simply don't pay attention to what they're "supposed" to, so trying to misdirect them doesn't work as well. And they will have fewer expectations, because they don't have as much experience with life. Finally, they love to "bust" the guy on stage. So, when performing in front of the kids, have a plan in case they see through your tricks and announce it loudly.
(3) Along those lines, it can be fun to perform some obvious trick that the kids WILL see right through, but then use that as a lead-in to a trick which is even more impressive and blows the "explanation" out of the water.
(4) Professional Conjurer James Randi had a great answer prepared for when people asked, "How do you do that?" He would say, "Very well, I hope." [ Xenolan's advice column | Ask Xenolan A Question ]
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