As always, props, props, props. You don’t need a lot of them, in this case its just a rocking chair from some grocery store that was acquired a long time ago, but even one good prop can go a long way in terms of giving your subject intrigue and something to do. After all, having something to do just makes for a better photos usually when it comes to people.
Next, of course, is fashion. I suggest working with the parents on this when it comes to kids. At least one parent will have nice set of cloths to work with but do take it a step further and tell them what you have in mind. That way you can coordinate your photo shoot with their wardrobe options. I guess the point I am trying to make is the communication aspect of photography extends well beyond what you are saying in your photos. Talk to everyone involved as information is key for everyone to do what they need to do.
This is a two-light setup. One strobe with a softbox and a grid up high aimed down at the subject – the key light. Then the kicker light – a speedlight in back just off to the side with no modifiers. Photography doesn’t have to be complicated or it can be extremely complicated, it really is a matter of what you are going for.