Dress them in matching outfits. Make sure to let them eat something really messy for lunch so that their outfits are properly accessorized. A backdrop of moving boxes is a must.
And speaking of accessories, make sure you have a tiara. And a pink bear. Because they're members of the family. Make sure the bear is wearing a diaper. You don't want stuffed bear pee on the furniture, after all.
Don't bother telling your son that he's supposed to sit on the couch with the girls (one of whom seems to be playing the Human Claw game with a baby's head...).
And make sure that bear is in the PERFECT position.
The babies can slump, but that bear better be sitting up...
Turn on the flash because your son is freaking out that the little light hasn't popped up.
Demand awkward fake smiles.
Make sure to capture at least one child blinking.
And at least one kiss.
Hopefully the kiss will make a baby cry.
Give up on the brother, instruct big sister to give the stiffest faux-smile possible.
Re-position babies, then remember big sister is only 2 years old and probably shouldn't be "holding" both babies at once...
Rescue babies before big sister can fling them off the couch because she's done.
So there you have it. A failed, if somewhat amusing, photo session.