I generally agree with the comments above that these are pretty solid.
You need to watch shadows and placement in the frame but otherwise you are right on.
I think the clear winner is #4 because of all the emotion and connection in the shot.
I suggest that you crop to 4 x 5 to make them more prominent and remove some of that space above them.
Then lighten their faces only and darken the background slightly.
Then warm the picture some to get rid of that bluish cast that often appears when shooting in the shade. (IMO, children look better in warm-ish pictures)
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