The old Canon 20D
Take an old Canon 20D, a couple of studio lights, a white wall and a sprinkling of small children for a recipe for success. Mike gave me this cast-off when he upgraded his camera and this is what I did with it. The quality of this amateur camera was and still is phenomenal. I now use the Canon 5D Mk 11 but I still can't part with it.
It really helps when you have 6 grandchildren to photograph. The older ones have been so used to having a camera trained on them, that they know exactly how to pose! The babies are getting used to it gradually.