I wouldn't go with an all rounder... this kind of kit lens will do a lot but all it will do will mostly be inferior to what you could get with some specialized lens.. no need to go for a fish eye here or some crazy lens that you can never use.. but I suggest you find what you want to do most and buy a lens that do that well..
You could start with a 50mm f/1.8 this is cheap and would cover portraits very well.
You say you want to use it for "mostly" indoor/outdoor and still/moving subject... that's about everything that exists.. if your boys are your priority, you can use the cheap 50mm f/1.8 for portraits when they are not too close and don't move too fast... Then you could add a 35mm f/1.8 for indoors + normal focal lenght... and a 16-85 would be your more versatile lens...
personally I'd complete the 35mm + 50mm set with a 10-24 ultra wide angle (or tokina 11-16) for your wide angle needs (small rooms, fun effects inside, landscape, etc..) and a 70-200 f/2.8 for outdoors, sports, etc.. That would be more expensive than your current budget.. but you could start off with the 35 + 50 primes and then build your kit based on your needs as your boys grow up..
Also, I believe that person who suggested you the 135mm made a quite interesting suggestion as this lens, even if it's far from being versatile, would get awesome portraits...
