I don't know what you consider a motor rebuild, but you didn't need one. You could get a crank kit from most auto parts stores and install it. Your hubby could probably do it. I did one on my son's car years ago by myself in one day's time. Pulled the engine, keeping it as complete as possible, removed the oil pan, undid the rod caps and laid them aside, installed the crank and new main bearings, then replaced the rod bearings one at a time and rebolted them. Then reinstalled the engine. It's a lot cheaper than buying a rebuilt engine.
Just illustrating that ignorance is not always bliss. Had she posted here 1st, she could have gotten free advice. And shame on her mechanic for not suggesting it.
This sentence was a big part of the decision to have a professional take care of our engine. Your son is very fortunate that you were able to take care of his engine. Sometimes some people have to bite the bullet and pay to have things done. 'but you didn't need one.' I find this statement interesting, that you feel so strongly about the situation when you weren't close by. Which is really too bad, perhaps we could have had you help with the problem. But we were left with only the diagnosis of three different mechanics to make our decision.
Wow! Water under the bridge guys. The actual point I was trying to make is that we haven't started to work on our wagon...yet.