I'd also vote for a Kruger viewing safari and a nearby hunting safari. I've hunted really good parts of "wild Africa" and seen or hunted all of the big five outside of parks except rhino, but it ain't gonna happen in Namibia without a LOT of driving from place to place, plus luck.
Your family will also have a much better opportunity to photograph any of the Big 5 in Kruger than while taking part in a hunting safari. Animals tend to be a little shy when hunted. You may see them in a hunting concession, but relatively briefly, and at longer distances. If that's OK with the rest of your family, go for it. But in my experience a family trip is better served with both some park viewing and some strictly hunting time.
