Sometimes I wonder maybe the family smiles because it was Michael's philosophy of life to always smile and even when he was a kid he would cry sometimes cause he didn't wanna do a show and then he had to go on stage and he would smile as if nothing was wrong.
Remember his favorite song Smile:
Smile though your heart is aching,
Smile even though it's breaking,
When there are clouds in the sky,
You'll get by
If you smile with your fear and sorrow,
Smile and maybe tomorrow
You'll find that life is still worhtwhile...
Maybe that's why the family smiles?