I.,
First, I want to tell you that you are only 1 year out of giving birth - you have the right to still be carrying some of that pregnancy weight! It sounds like your first priority is taking care of that wonderful baby boy, and you couldn't be more right. You sound like a loving, caring mother - so don't be so hard on yourself!
This isn't directly about losing weight, but it sounds to me like you need to join a moms club - there are some right in the Towson area, maybe check out the Towson Times. Those groups are moms and babies/kids who get together to play and socialize. I think you need a support group so that you will realize that you are beautiful the way you are!
That said, you may also find someone from that group to walk with - there's nothing like strolling the baby to help drop off the pounds. Also, you can turn your daily childcare activities into exercise. While you are rocking Andrew, hold him in your arms and do lunges or pretend your are stair stepping. He'll love looking in your face while you lie down and raise and lower him over your head.
I'm sorry that I can't give you advice on dropping the pounds quickly. I believe weight loss should be done in a healthy way, and a severe diet wouldn't be good for you or for your son. Because you are concerned about how the inlaws are going to react, maybe you should also consider looking into some really good support underclothes. There was just a program about that on the Today show - according to them, you can get great stuff at places like Target that aren't expensive. And then go get a couple of really great outfits that drape nicely over your lovely curves. Good support and nicely fitted clothes can visually drop those pounds too.
I wish you the best of luck - and remember, you are beautiful!!
-M.