I am sure I am pretty much stating the obvious here, but you never know, maybe someone will have an "aha" moment while reading this post!
This will be short and sweet, but for me, I much prefer to see natural smiles in images of families and children verses the "say cheese" smiles! So here is a quick tip. Play the tickle game while taking pictures! Mom and dad, tickle your kids! Have the kiddos tickle YOU! Have them tickle each other! That is, for me, my greatest secret in getting natural smiles from children AND adults! If you are taking pictures of your kids, and cannot get a natural smile out of them, go up and tickle them and then step back and take the shot. I promise you will see such a difference! So now that you are all much wiser because of this post :) Happy shooting!