First outdoor family shoot

So a friend of mine from high school reconnected with me a while back. He started seeing my fb pictures I take of my family and friends and asked if I could do shoot his family. Well, here are the results. I would very much appreciate some C&C. Any tips on this type of thing will be appreciated. The thing I find most challenging in this shoot was posing. The second was trying to get the little ones' attention. I really enjoyed it and they were totally happy with the way these came out.

I love the lighting in that second shot!