I LOVE keeshonds! I grew up with one and then adopted my own little girl after I graduated from college. They are a wonderful breed of dog, extremely loyal, amazing with kids and easy to train. I adopted Lola when she was just under 2 and she lived alone with me for years before I got married and had my daughter. She adjusted great and we never worry about her being aggressive (I worry about other dogs however and am careful with my daughter). I highly recommend this breed :)
Oh and about the grooming - when I'm not financially strapped, I take her to the groomers every 8 weeks. That's it. After I lost my job several years ago, I did go for quite a few months without taking her to the groomers and she was just fine, a little scraggly though. You can take her less often if you brush her everyday.
I've never crated her and she is very good. She doesn't chew on anything, and neither did my parent's keeshond. They are actually not super active dogs. I also grew up with labs and a golden retriever and they are MUCH more active. When I was working full-time she only needed to go out twice a day, but now that I'm a SAHM, she goes out more often. We also don't have a fenced in yard and I can let her out and know she will never run away. They really are that loyal (my parent's was the same way). Of course, you couldn't trust a puppy not to stray, but in good time this breed is extremely family-oriented and won't run.
One more thing - if you're a SAHM, I would say you'll be fine with handling the puppy and little boys. I really think it's nearly impossible to train a puppy if you're working full-time and it will take a lot longer. If you are working, I'd look into adopting a young (1-4 year old) keeshond like I did. Lola was already trained and never had mistakes so it worked out because I was working full-time.