Hello Hotpocket, welcome to Camera Labs!
If you are willing to stay in Olympus' 4/3 path, for flash there are two options: FL36R or FL50R. For the camera kit, depend on the budget and you're serious about your business: if you have big budget may I suggest to upgrade your kit to Olympus E5/E620 with Olympus Zuiko 12-60mm, and Olympus Zuiko 50-200mm to accompany the E5. it should be enough for family outdoor photo.
*if you have extravagant budget, get the Zuiko 14-35mm f2 and Zuiko 35-100mm f2!
“Photography is about a single point of a moment. It’s like stopping time. As everything gets condensed in that forced instant. But if you keep creating these points, they form a line which reflects your life.” – Nobuyoshi Araki