They're a good start, and you have captured a couple of cute family memories. As scrap-book shots, they're great. As portraits, well, there are a few issues.
In the first (In future, please number your images to facilitate response) you've got a good a good moment & expression, but your subjects are much too close to the background. Try for at least 6-8' of separation. Your exposure isn't bad, but it's a tad hot. The specular highlights on the shirts are blown in some areas. I think overall, dropping by about 1/3 stop would help. Lastly is the composition. Why a square crop and one which cuts them off at the knees? A portrait orientation could have reduce the empty space above and on the sides as well as capturing all of their legs.
The second unfortunately is very soft. I'm not sure if you missed focus or it's motion blur (I can't access EXIF data right now), but regardless, it's badly out of of focus. Exposure is just a bit under in this case, and again, the child is too close to the background.
Keep shooting; when you've got built-in models, there's no reason not to get LOTS of practice!
Just my $00.02 worth - your mileage may vary.
~John