When asking someone to use your camera to take a picture of your family, make sure they know who is in your family.
Now my cousin Katie whom I asked to take the picture knows who is in my family but she happened to miss dad on all 5 pictures that she took of our family. Katie, I have to admit that I was upset at first, I mean this is my brothers wedding and this is my family picture. But now, I kinda think it's funny. It took me some time to get over it. But I'll just buy a family picture from the photographer...she was good after all.
So just make sure when you hand off your camera that the person taking the picture knows who you want to be in the picture.