OK. 12 images is too many to give detailed C&C on. Most people here suggest no more than 5 or 6.
1. Pose is very stiff - but that's normal with boys of his age. Maybe try to catch him playing around? You got him in a 3/4 pose which works but the crop puts him in the centre with too much dead space behind; it would look better with him on the right looking into the photo.
2. Nice work on cutting him out and superimposing him on the background image BUT you need to take him out again, flip his image horizontally and put him back (same position) so that he's looking into the image and towards the bat symbol.
3. Cute young lady but you cut her off at the shoulder on the right. Always try to avoid cutting off at joints.
4. Mr cool with a star.
5. Lovely! Nicely positioned, too. A touch on the cool side (needs a little more warm toning).
6. LOVE the faces and expressions. Background isn't the best and detracts from the image. Also too cool and the colours are too flat. Take it back to LR and play with the sliders.
7. B&W doesn't solve the issues this time.
7A. Nice lighting and nice pose but the bar she's leaning on detracts due to the scruffy paint spots.
8. Great models. the gentleman's expression is magic and the little girl is good, too. I like the pose but again the bar is an issue.
9. The gentleman gets the prize for expression again but the young man has also managed to crack a smile.
10. Nice family group - colours could do with a little warming up.
11. Well done to your daughter! Tell her that the DoF was a bit too shallow.
Overall some nice shots for the family album and a good basis for learning. You've got some models worth working with, the lady and gentleman would make a great pair