Don't do it!!!!!!

I have shot weddings and you cannot believe how much work they are before, during and after. You are the grandmother. Enjoy the day, the events, the family, the friends, and, yes, your new in-laws. Those will be your real memories.

Now for the gruesome news. What if something goes wrong? Even the best wedding photographers have days they regret. Do you want to be remembered for the screw up? When your greatgrandchildren ask where are the wedding pictures, which crack in the floor do you want to disappear through? And what will you wear? As a working photographer, I am not sure you can wear the same clothes as the grandmother of the groom.

Finally, this is not the time for on-the-job training. Weddings are an art in themselves. Portraiture can be extremely demanding with restless kids running around, an anxious bride, and harried mothers hoping everything goes right. And then, what about pictures with grandma in them?

Enjoy the day. Take your camera and take what you want when you want. You will get pictures no pro can get.

I like them, I agree with comments on #2, plus you might sharpen a tiny bit.
I think the idea of your son's picture with the reflection is great, but would love to see his whole reflection, Just me;)
Maybe backing up and then cropping to include the whole reflection. Also, if you use Photoshop or some other software, you could lighten him so his details would be a little more noticable. would you like me to give it a try. however, I still think the shot is great. Love it!

On the baby shot - try laying on the ground and shooting at his eye level...you will be surprised. just a hint.